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Re: Can a PC operate a BOSS 5 or 6? (and a question)

Raymond Heckert
 

Check to make sure that the Z-axis isn't binding up somewhere. Also check
that the timing belt is 'drum-tight', and free of oil, grease, etc.

RayHex

-----Original Message-----
Date: Monday, September 04, 2006 4:01 PM
Subject: [CAD_CAM_EDM_DRO] Re: Can a PC operate a BOSS 5 or 6? (and a
question)


<snip> One problem I've had recently is the Z axis stepper keeps
losing steps. I wrote about a month ago and said it was losing
power (by the way thanks to all who replied, I don't get on here
very often), but a few changes in my acceleration profile, and it
seems to run pretty fast again. However all the adjustments I make
don't seem to fix the step loss problem. It doesn't lose them all
the time either. I'm running a 3d profiling program with about
65,000 lines of code, with the top of the part at Z0, and the bottom
at Z-.150. By the end of the program its usually off by about .050"
but sometimes as much as .200". Also this motor seems a lot hotter
than the Y and X motors, although they are all the same kind of
motor.

I'm considering changing to servos, but don't have any experience
with them. Would I be able to change just the Z axis to a servo and
geck0 3whatever, and leave steppers on x and y? I found what looks
like a good deal on www.homeshopcnc.com and would like to know if
this servo would drive this machine.
foam cutting current ?

 

Hi all,

Is there a formula to help select the proper voltage and current for a
foam cutter ?

Any special wire ?

Dave
Re: Open (i think) design for a parallel robot (reprap ma

Carl Mikkelsen
 

A decent parabola would require a rather large billet to start with, and a lot of material to be removed. I agree that it would be a good test.

The proposed test came out of a discussion of quantization error, which intrinsically prevents a hexapod from cutting a smooth plane, unlike a Cartesian machine which could cut a perfect plane.

What I was curious about is how to measure the small-scale deviations from the desired shape. Isn't this property called surface roughness? What is a simple way to measure surface roughness?

-- Carl

At 11:44 AM 9/4/2006, gran3d wrote:

Yes, a flat plane and a bowl are excellent tests for a hexapod. You
might also include a parabola. The focus point would be a good (if
analog) measurement of both the overall shape and the surface
roughness. Use it to reflect the sun onto something. The fuzzyness
would reflect the roughness. The evenness would reflect the shape
accuracy.

Carl Mikkelsen wrote:

What are good ways to measure surface smoothness? It would be
interesting
sometime to attempt to cut a plane, and see what the error actually
is, and
somehow estimate what portion is quantization related, vibration
related,
calibration related, and simple actuator error related.

One test I can think of is to try to cut a "bowl", the inside of a
hemisphere. I
would think a lot of motion artifacts would show up in that, especially
stickiness
or backlash in the struts.

Jon Elson
D2nc update v1.0.1

Graham Hollis
 

I have posted D2nc version 1.0.1 at www.d2nc.com available for download.

Most of the feature requests I received have been implemented:

IJ absolute mode.
Selectable compensation strategy.
User settable colors for the shape display and background.
Shape detail display.
Other minor improvements.

Many thanks
Graham
www.d2nc.com
Re: Can a PC operate a BOSS 5 or 6? (and a question)

 

I've been running a Boss 5 from my pc for over a year now. I use
Deskcnc, which seems to do a great job of running the mill, but I
don't use it much for programming. I've got gecko 201s and they
drive the stock stepper motors pretty well.

Now that i've said it can be done, I have a question for everyone
else. One problem I've had recently is the Z axis stepper keeps
losing steps. I wrote about a month ago and said it was losing
power (by the way thanks to all who replied, I don't get on here
very often), but a few changes in my acceleration profile, and it
seems to run pretty fast again. However all the adjustments I make
don't seem to fix the step loss problem. It doesn't lose them all
the time either. I'm running a 3d profiling program with about
65,000 lines of code, with the top of the part at Z0, and the bottom
at Z-.150. By the end of the program its usually off by about .050"
but sometimes as much as .200". Also this motor seems a lot hotter
than the Y and X motors, although they are all the same kind of
motor.

I'm considering changing to servos, but don't have any experience
with them. Would I be able to change just the Z axis to a servo and
geck0 3whatever, and leave steppers on x and y? I found what looks
like a good deal on www.homeshopcnc.com and would like to know if
this servo would drive this machine.

thanks
Nathan Clymer
Re: Can a PC operate a BOSS 5 or 6?

Les Newell
 

If you decide to replace the motors then seriously consider fitting servos. It will probably work out slightly more expensive but the reliability and speed will be far better than steppers.

Les

Tim Goldstein wrote:

Dan,
You will most likely want to replace the stock drives with something like
Gecko G201 units and a matching power supply. The stock drives are known for
failing and are very old full step or half step technology depending on the
specific version. The Geckos will greatly improve the reliability and
smoothness. You also need to make sure that the stepper motors are still
good. They are known for getting partially demagnetized when the drives
blow. You may want to consider just replacing the motors with some more
modern units. The old finned Bridgeport motors are very high inductance and
will restrict the rapid speed you can achieve. These machines give you great iron to work with and the ball screws and
mechanical set up would be very expensive to put on a mill yourself. But the
electronics and motors are mostly outdate and the mill will benefit greatly
from replacing them.
Tim Taig 2019CR mills in stock for immediate shipment with a discount off list. Taig products at Discount www.KTMarketing.com/order A2Z CNC www.A2ZCNC.com USA made accessories for desktop mills & lathes. Addresses: FAQ: FILES:
Post Messages: CAD_CAM_EDM_DRO@... Subscribe: CAD_CAM_EDM_DRO-subscribe@... Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@... List owner: CAD_CAM_EDM_DRO-owner@..., wanliker@..., timg@...
Moderator: pentam@... indigo_red@... davemucha@... [Moderators] URL to this group:
OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.

I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
bill
List Mom
List Owner
Yahoo! Groups Links
Re: Open (i think) design for a parallel robot (reprap ma

 

Yes, a flat plane and a bowl are excellent tests for a hexapod. You
might also include a parabola. The focus point would be a good (if
analog) measurement of both the overall shape and the surface
roughness. Use it to reflect the sun onto something. The fuzzyness
would reflect the roughness. The evenness would reflect the shape
accuracy.

Carl Mikkelsen wrote:

What are good ways to measure surface smoothness? It would be
interesting
sometime to attempt to cut a plane, and see what the error actually
is, and
somehow estimate what portion is quantization related, vibration
related,
calibration related, and simple actuator error related.

One test I can think of is to try to cut a "bowl", the inside of a
hemisphere. I
would think a lot of motion artifacts would show up in that, especially
stickiness
or backlash in the struts.

Jon Elson
Re: Can a PC operate a BOSS 5 or 6?

 

I came across two Bridgeport
BOSS's one made in 1977 the other made in
1982. Both of them are stepper units. Can I operate them using PC
running Mach 3? What kind of difficulties might I expect?

Dan
Dan,

You will most likely want to replace the stock drives with something like
Gecko G201 units and a matching power supply. The stock drives are known for
failing and are very old full step or half step technology depending on the
specific version. The Geckos will greatly improve the reliability and
smoothness. You also need to make sure that the stepper motors are still
good. They are known for getting partially demagnetized when the drives
blow. You may want to consider just replacing the motors with some more
modern units. The old finned Bridgeport motors are very high inductance and
will restrict the rapid speed you can achieve.

These machines give you great iron to work with and the ball screws and
mechanical set up would be very expensive to put on a mill yourself. But the
electronics and motors are mostly outdate and the mill will benefit greatly
from replacing them.

Tim
Taig 2019CR mills in stock for immediate shipment with a discount off list.

Taig products at Discount
www.KTMarketing.com/order

A2Z CNC
www.A2ZCNC.com

USA made accessories for desktop mills & lathes.
Re: Open (i think) design for a parallel robot (reprap may be interested)

Mike Pogue
 

Ah, OK...I understand what you're saying now...Yep, I agree.

Mike

Graham Stabler wrote:

--- In CAD_CAM_EDM_DRO@..., Mike Pogue <mpogue@...> wrote:

I am guaranteed to always be as close to the circle in stepper motor coordinates as it is possible to be with steppers. It's not a PID algorithm, so I don't have overshoot to deal with.

Note that the quantization introduced by the steppers is way smaller than the backlash in the mechanical stuff.
I'm just saying that the quantization exists, you said it didn't
because the number of decimal places in the control program matched
that of the steppers. There will always be some difference between
where the tool should be and where it is if the position of the tool
is discretized by steps.
I'm not saying its a problem.
The other point was simply one about numerical accuracy, its academic
but when defining a circle say in a PC even at 64 bits there is some
quantization error. Its academic because the error is smaller than
the machine resolution.
Graham
Can a PC operate a BOSS 5 or 6?

 

I came across two Bridgeport BOSS's one made in 1977 the other made in
1982. Both of them are stepper units. Can I operate them using PC
running Mach 3? What kind of difficulties might I expect?

Dan
Re: Fadal Drilling speed

smeboss
 

Thanks Ken

Very helpful information!

Charles

--- In CAD_CAM_EDM_DRO@..., "Ken Campbell"
<deltainc@...> wrote:


----- Original Message -----
From: "smeboss" <c65pratt@...>
I'm wondering how fast a Fadal 4020 can drill a series of 15/16
holes
thru 3/8 mild steel, rectangular patttern, 2 rows of 4, 4"
centers?

Charles
*
One advantage of controlled feed ( cnc or leade screw control ) is
that you
don[t slow down and work harden the steel being cut .. with hss
drill, 2
flute, try 0.001 per flute per turn, so a 1/2 inch plunge would
take about
1/4 minute at 1000 rpm.
This is per hole, so have to add up your fast approach rates, and
if you a
lot of these you could go to carbide tooling and about double that
rate.

If high accuracy in locating the holes is important, even with a
sturdy
mill, you might want to do a center/starter drill "peck" on each
hole first
.. this would be almost as fast as rapid traverse to each hole
while
pecking, the peck diamter only has to be a teensy wider than the
flat on the
larger following drill point, ie the following larger drill is
located by
the angled cutter tips, not the center flat.

Hope this helps. note the brand of the drilling machine does not
matter (g).
ken campbell, deltawerkes





--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.405 / Virus Database: 268.11.7/436 - Release Date:
9/1/2006
Re: Fadal Drilling speed

smeboss
 

Hi Steve

Thanks
for the information! This is very helpful!

Charles

--- In CAD_CAM_EDM_DRO@..., Steve Blackmore <steve@...>
wrote:

On Sat, 02 Sep 2006 21:20:13 -0000, you wrote:


I'm wondering how fast a Fadal 4020 can drill a series of 15/16
holes
thru 3/8 mild steel, rectangular patttern, 2 rows of 4, 4"
centers?

I don't have any experience with these machines, but it takes me
about
30-60 seconds per hole manually.
Ignoring that specific machine, my feed/speed tables reckon 2
inches per
minute at 400 rpm, using a HSS .9375 inch drill in mild steel.
Power
requirement for that is .35 HP.

A CNC machine should be able to drill all 8 holes in approx 2 1/2
minutes from start to finish.

Steve Blackmore
--
Re: Fadal Drilling speed

smeboss
 

WOW! That's fast, I was thinking of using a carbide insert drill
from Allied Machine & Engineering Corp. (Doall)

Thanks for the information!

Charles

--- In CAD_CAM_EDM_DRO@..., "skullworks"
<skullworks@...> wrote:

--- In CAD_CAM_EDM_DRO@..., "smeboss" <c65pratt@>
wrote:

Hi Guys

I'm wondering how fast a Fadal 4020 can drill a series of 15/16
holes
thru 3/8 mild steel, rectangular patttern, 2 rows of 4, 4"
centers?

I don't have any experience with these machines, but it takes me
about
30-60 seconds per hole manually.

Thanks

Charles
Once you get into full sized CNC machines its not so much a
question of
what the "machine" can do, more a question of what the tooling can
do.

I had to drill a double grid pattern of 20mm holes on 26mm centers
in
3/8" hot rolled. (heat exchanger end plates)

Using a Mori Seiki SV50B (CAT40) and a Kennametal solid carbide
drill I
was punching thru in 1.3 seconds...

Feed .027" / rev.

OK I know the Fadal won't quite do that (it was requiring about 24
of
my 30HP) but it would get close with optimal tooling.
Re: Mitutoyo Linear Scale AT715 signal format?

 

THe scales are probably distance coded not straight quadrature.

Harko

On 9/2/06, Jon Elson <elson@...> wrote:

mayfieldtm wrote:

Does anyone happen to know the signal format for Mitutoyo Linear
Scales, series AT715?
I want to interface one to a microcontroller such as a PIC and need
the pinout and signal information.
These scales are intended to be exclusively connected to Mitutoyos KA
Counters.
These scales are Absolute reading units and I'm assuming they spit out
a continuous stream of serial data to indicate current position.
Or they send data upon a request, or???

Probably they are just quadrature incremental encoders with a special
index
track. The way most of these work is that the number of quadrature
counts between
index marks is different between every pair of index marks. So, you
only need to
pass by any two adjacent index marks, and you know where you are. This
is the
simplest form of absolute encoder, and it takes no more electronics than
a standard
encoder with one index mark -- just 3 optical channels. A little bit of
software
in the readout box computes the absolute position. This requires a
small move
of the machine after turn-on before the absolute calibration is set.

Jon
Re: Now for a change of pace: PlasmaCAM

 

--- In CAD_CAM_EDM_DRO@..., Jon Elson <elson@...> wrote:

Ron Yost wrote:

I wonder how much they sell for ?

Dave

I did a little searching by Google and the only pricing info I
found was a
posting by someone on a (non-PlasmaCAM) forum somewhere. He said
they're
'about $10,000'. May, or may not, be accurate. I found NO
independent
reviews of the thing at all! Not one! Maybe someone else has?

One fellow on a forum said they're not nearly as robust as they
appear
in the purty pictures on the PlasmaCAM site, for what that's
worth.


This is not a great surprise. As best as I can tell, he has the
rack
mounted inside
a steel channel, and some kind of carriage rolls either slong the
inside
of outside
of the channel. Since plasma is a horribly dirty process, this
seems
like a pretty
good design from the standpoint of resisting contamination. But,
you
can't expect
great accuracy from structural steel components. And, since there
is no
scheme
to prevent racking of the bridge axis, that is going to put some
stresses on the
thing that may accelerate wear.

$10K just seems a bit high for a basic X-Y table with a little Z
travel.

The fact there's no pricing info on their site is a red flag, to
me. I
like companies who are up-front with such things. If they're not,
they're
usually hiding something, in my experience. In this case, I'll
bet it's
the lack of value for $$ spent. Something you're not supposed to
realize
until after the dotted-line has been signed and the thing is in
your
possession.

One's supposed to watch their video and send them 10-large (or
whatever).
Basically sight unseen. They discourage contact with present
owners,
provide no references at all, and you -can't- actually see and
touch
the machine at the 'factory' before purchase. Gee, I wonder
why?? :)


No posted price is not a great concern to me - yes they want you
to
call, not too
unusual. If all the rest of the previous paragraph is true, then
that
DOES raise a
red flag, for sure. Might be time to do some Google searches on
the
trade name to
see if anyone has posted from their experience.

Jon
The PlasmaCAM solution is for the person that wants nothing to do
but turn on the machine and start cutting. There is nothing DIY
about it. They are expert marketers and they have a software
interface that is their primary selling point. If you watch the
video, the software is so good you can almost just "think" about a
part and it will cut it. They show importing a bitmap and clicking
a few buttons and cutting out a part. In real life the reports are
that it's not quite that easy and reviews are mixed. It will import
DXF so you are back to the basic CAM toolpath functions. It's the
software that attracts their customers since it appears to solve the
issue of: fear of computers and software.

Their machine is totally proprietary and works ONLY with their
software and controller. If something breaks you have to get the
part from them.

Four years ago they were one of the few ready-to-run low cost plasma
CNC machines out there, but there are now several other mfgs of mid
range tables built using various approaches and some with more open
designs that lend themselves to selecting the best mix of CAD CAM
and Control.

Since this list is for people interested in building/modifying their
own CNC machines the further discussion of specific brands/pricing
would better be moved to the Plasma specific lists.

What is a valid topic of discussion is the specific design of a
commercial machine and how it could be utilized by the DIY builder.
All of us have looked at other designs or commercial machines to get
ideas. PCAM and others inspired my initial plasma table design but
there is no substitute for experience!

Tom Caudle
CNC Retrofit knowlegebase - Request for your input

 

In a message dated 9/3/2006 9:08:13 A.M. Mountain Daylight Time,
bigjamma@... writes:

Failing that, I'd
really appreciate your favorite sites, links, posts, build reports,
and any specific piece of knowledge you're willing to share.





I would make the following suggestions, first visit: CCED FAQ:
_ () a link on
the bottom of every CCED post.
A lot of effort has went into setting this up, by Tim Goldstein, and others,
all volunteer.

When you visit any URL, always click on Links if any are available, follow
each link in turn, and then follow the links at each site you go to. By the
time you have done that you will have a heck of an education on how many
people have done things.


I agree that there is no centralized location for everything, and I think
the reason why, is few if any have the time or inclination to do all of the work
necessary to do so. There are so many variables, that the best one can
expect to find some answers to the path they have chosen to pursue in there
quest for a "homeshop" CNC experience.
Even the word "homeshop" has as many meanings as there people with CNC in
there "homeshop"
Also the changes being made constantly are almost overwhelming, as new
products come out, new methods are implemented.

If you wish to proceed, you have my blessings, and I am sure the blessings
of the entire home CNC "homeshop" community.

This group was started in 1996, with a total of 13 members at that time, as
a result of myself, not being able to hear the speakers at the CNC seminars at
the NAMES show in Detroit. Out of that frustration, I asked if others
wanted an online place where we could communicate our knowledge, and problems.
At that time information was hard to find, but as the groups grew, there was
more and more machines converted, and more and more information became
available, along the way various people started building kits, providing hardware,
and software, and a willingness to help others along the way.
Since then, with various problems along the way, we now exceeded 9500
members. How many are still active, I have no clue, how many have built there
machines and left us, I have no clue, how many are inactive, I have no clue. But
we are here if you want information from the group.
If you ask, you will normally get a rapid and valid answer, but no one here
is going to lay out an exact step by step process, because it is impossible,
due to the extreme number of variables that one faces.

I want to thank all of the moderators, and those that have been the
fountains of knowledge back at the beginning, and every since, for there endless help.

What machine do you want to use as the basis of your CNC?
How deep is your pocketbook?
What are your technical and mechanical abilities?
What do you want to do with your machine?
The list is pretty much endless.
bill
Re: Open (i think) design for a parallel robot (reprap may be interested)

Graham Stabler
 

--- In CAD_CAM_EDM_DRO@..., Mike Pogue <mpogue@...> wrote:
I am guaranteed to always be as close to the circle in stepper motor
coordinates as it is possible to be with steppers. It's not a PID
algorithm, so I don't have overshoot to deal with.

Note that the quantization introduced by the steppers is way smaller
than the backlash in the mechanical stuff.
I'm just saying that the quantization exists, you said it didn't
because the number of decimal places in the control program matched
that of the steppers. There will always be some difference between
where the tool should be and where it is if the position of the tool
is discretized by steps.

I'm not saying its a problem.

The other point was simply one about numerical accuracy, its academic
but when defining a circle say in a PC even at 64 bits there is some
quantization error. Its academic because the error is smaller than
the machine resolution.

Graham
CNC Retrofit knowlegebase - Request for your input

 

I've been dreaming of a CNC conversion of a knee mill for some time
now. For the past couple of years, I've been reading all the familiar
Yahoo groups (DIY CNC, CAD CAM, Mach, Gecko, etc) along with the
boards on CNCzone. I'm finally in a position to begin working on this
project, but I'm surprised just how little of the vast amounts of
knowledge & expertise that flow through this community have actually
been captured in a central place.

Now, I realize there is no cookie cutter path to a CNC retrofit. This
is a complex systems integration effort with many possible paths to
success. However, that doesn't preclude the collection of "best
practices" or pros & cons or "if/then" project planners, and the
like. If I had been diligently making notes and saving bookmarks over
the years I could fill a good sized book. Sadly, I haven't, but more
poignantly, I don't believe the larger community has done much better.

I'd love to be shown that I'm wrong, but let me expand upon this
comment with a little "for example". Here's a sort of FAQ topic list
(and only for a mill conversion at that), but I challenge anyone to
show me where one can get insights (pictures, plans, sources,
personal experiences, reference articles, etc) on these issues *in a
centralized place*. I know the info is out there, but it's highly
scattered, and much of the best stuff simply slips by like the
proverbial sand through fingers:

- What are the pros and cons of different types of machines to use
as a starting point? Old Bridgeport vs New imports? Knee vs square
column?

- Steppers vs Servos? (so often asked I was surprised how buried
the "reference" posts are)

- If steppers, what are the popular drive (and motor and accessory)
options? By pricepoint? By application? (e.g. small/med/large mill)
Real world experiences? Advantages/disadvantages? Ditto the above for
servos.

- Given a chosen path (e.g. Servos on a Bridgeport-type knee mill),
are there any sample controller box plans? What's a breakout board
and why do I need one? Wiring schematics? Build reports? Recommended
parts suppliers? Tricks & traps?

- What IPM is recommended given the application? What are the calcs
to determine a possible reduction to get there?

- Motor selection/testing? Power supply matching? Encoders?
Suggested resolution?

- Continuing the example of a Bridgeport-type retrofit (although
there are related issues for any path chosen), what are the Z-axis
pros and cons of driving the quill vs knee? What are some admired
approaches for the Z-axis quill drive? (good examples here are
particularly difficult to find, yet this problem has been solved
hundreds of times by people in this community who are willing to
share this knowledge)

- What are similar admired approaches to the X & Y axis (although
examples here are easier to find)?

- Ballscrews - are ground worth it vs. rolled? Who sells them?
What's involved in their installation?
Is it ever appropriate to use leadscrews with modifications? What are
those modifications?

- What are my software options? This is a huge topic in itself and
goes way beyond the choice of Mach vs EMC, and is ever changing,
particularly when you consider CAD & CAM options in the software
chain.

And the list could go on and on and on (pendant options? Mach 3
screen customizations? Benefits of a dedicated pulse generator like
the G100?)

What's my point in asking you to read this rather long post? I'm
impressed with the knowledge of this community and the spirit of
sharing that exists within it. However, I'm frustrated by the fact
that this knowledge is not being captured efficiently, compendium
style. Some of this is due to the temporal nature of the mailing-list
centric groups that dominate the community. If you don't keep up with
the posts, the knowledge they contain is as good as gone.

There are any number of technical approaches that could help here,
including hyperlinked FAQs, "sticky" topics within forums, and wikis.
Of these, it strikes me that a wiki would be the ideal knowledge
repository given the multiple author contribution and maintenance
requirement of the task at hand.

However, the first and most important thing is to collect the
knowledge to be centralized in the first place, if only as a starting
point. I gladly volunteer to be part of this effort and welcome the
help of others. The ideal response to this post would be, "Hey,
dummy, that exists and it's all at this link". Failing that, I'd
really appreciate your favorite sites, links, posts, build reports,
and any specific piece of knowledge you're willing to share.

I will summarize all responses, add them to my research, and --
working with any other volunteers-- figure out a good place to put it
all. No or poor responses will simply result in no or a poor end
product, so if this is interesting to you, please take some time
to "pour some knowledge". With better knowledge management, more
people will get involved in this community, which will lead to more
perspectives, more creativity, more (and possibly cheaper) products,
and more fun for all of us.

I will cross-post this on a few lists to try to maximize response. My
apologies beforehand if you see it more than once.
Re: Fadal Drilling speed

Raymond Heckert
 

If you go the CNC route, I'd strongly suggest you look into one of those
'slugger' type drills. They cut much faster, and with less power than
conventional drills, and you don't have to drill through the 118 lead angle
of the point. Best of luck...

RayHex

-----Original Message-----
Date: Saturday, September 02, 2006 2:52 PM
Subject: Re: [CAD_CAM_EDM_DRO] Fadal Drilling speed



----- Original Message -----
From: "smeboss" <c65pratt@...>
I'm wondering how fast a Fadal 4020 can drill a series of 15/16 holes
thru 3/8 mild steel, rectangular patttern, 2 rows of 4, 4" centers?
Charles
*
One advantage of controlled feed ( cnc or leade screw control ) is that you
don[t slow down and work harden the steel being cut .. with hss drill, 2
flute, try 0.001 per flute per turn, so a 1/2 inch plunge would take about
1/4 minute at 1000 rpm.
This is per hole, so have to add up your fast approach rates, and if you a
lot of these you could go to carbide tooling and about double that rate.

If high accuracy in locating the holes is important, even with a sturdy
mill, you might want to do a center/starter drill "peck" on each hole
first
.. this would be almost as fast as rapid traverse to each hole while
pecking, the peck diamter only has to be a teensy wider than the flat on
the
larger following drill point, ie the following larger drill is located by
the angled cutter tips, not the center flat.

Hope this helps. note the brand of the drilling machine does not matter
(g).
ken campbell, deltawerkes
Re: L297/L298

 

On 9/2/06, turbulatordude <dave_mucha@...> wrote:
[snip]


Hi Vlad,

I thought that using big power FET's was a super simple solution to
the higher power problem ?

Not necessarily super-eimple, at least not for me, but yes, indeed, this is
the solution. You are absolutely correct. Just to quote myself from the
previous email:
Of course, one could argue that if higher currents are needed, one should
just go with discreet FETs anyway, and I wholeheartedly agree
:)

I was merely underlying the advantages of using L298 in some applications.

Vlad


Dave





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