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Re: first Pen and thoughts on moving forward

 

开云体育

Hi:

Keep your vacuum handy, or even attach to the tool post.

Carl.

On 8/7/2022 3:42 PM, Lex_Peacekeeper via groups.io wrote:

so made my first pen on my little unimat, I still need to get vacuum setup, but its a start

?

?

so here is the problems I faced

?

1) the fitting is to tight with this setup, do to the size of things (chuck and the live center) there is no room to place the work pieces on,
the gap that I could get with using the 3-jaw chuck could not even fit the brass nob to get that on

my thought on fixing this is to make the pen mandrill its own little mount thing if my measurements are right I can save about 15mm?
not a ton of space, but with that and taking off the live center I think that gives me the room to put stuff on without removing the tailstock in full

2) the ways got a ton of sawdust and chips on them during this, what are peoples thoughts on ways cover cloths and adding them to the unimat?

3) dont know if people have an idea on this, but with the insert tools about how long does a insert? last? or is it one of those things thats hard to pin down do to quality of inserts?
Re: Dial indicator holder for Unimat SL DB #db200

 

Please refer to this photo of my Unimat vertical post which I included in a recent message.? There is an aluminum bracket holding a dial indicator clamped across the two bars of the bed with two wingnut type of screws.? This is the machined bracket that has been made in the past by Ebay Seller "hkoesnadi".? It works very well and is easy to use.? Just slide up and down the bed and clamp where you need it.? With a 2" travel indicator it covers the majority of Unimat projects.? For me, I see no need to reinvent anything.? Now can someone manufacture this with 3D printing and have it as strong as the aluminum?

20220803_122112.jpg

Re: Dial indicator holder for Unimat SL DB #db200

Bill's Workbench
 

Carl, maybe that would work if I incorporated the mount in a riser for the headstock. ?Humm, maybe version 2.?
Re: Dial indicator holder for Unimat SL DB #db200

 

开云体育

Hi Gang:

What if the mount attached to the motor bracket? Then it wouldn't matter if you moved the quill or the carriage, it would still show the movement between the tool and the work!

Carl.

On 8/7/2022 8:08 AM, John Hutnick wrote:

My suggestion is to make it clamp across both bars.? At times Ebay seller hkoesnadi has made these from machined aluminum as a cross bed clamp.? If you can make yours strong enough, it should also help dampen bed vibration.

Re: steady rests

 

It looks like one I bought some years ago. It has one big negative IMHO. The three rods are not threaded into the ring making?fine adjustment?almost?impossible. One of these fine days, I going?to thread the holes?in the ring and replace the three rods with threaded rod.
Peter B in Sunny Florida.

On Sun, Aug 7, 2022 at 3:28 PM Lex_Peacekeeper via <Lex_Peacekeeper=[email protected]> wrote:
you might be able to copy the one that came with my Unimat, was told in another forum thats it looks very well setup and should handle anything you would out on a little unimat
Re: Train Related?

 

On Sun, Aug 7, 2022 at 12:25 PM, Carl wrote:
175364629061
it looks like photos of three lathes in all,?

lathes are used in hobby trains for making logs that fit into the cars, barrels, and even making replacement wheels and axels
I have a ton of train stuff from my grandfather and some of the notes talk about using a little lathe for stuff like that
first Pen and thoughts on moving forward

 

so made my first pen on my little unimat, I still need to get vacuum setup, but its a start

?

?

so here is the problems I faced

?

1) the fitting is to tight with this setup, do to the size of things (chuck and the live center) there is no room to place the work pieces on,
the gap that I could get with using the 3-jaw chuck could not even fit the brass nob to get that on

my thought on fixing this is to make the pen mandrill its own little mount thing if my measurements are right I can save about 15mm?
not a ton of space, but with that and taking off the live center I think that gives me the room to put stuff on without removing the tailstock in full

2) the ways got a ton of sawdust and chips on them during this, what are peoples thoughts on ways cover cloths and adding them to the unimat?

3) dont know if people have an idea on this, but with the insert tools about how long does a insert? last? or is it one of those things thats hard to pin down do to quality of inserts?
Re: steady rests

 

you might be able to copy the one that came with my Unimat, was told in another forum thats it looks very well setup and should handle anything you would out on a little unimat
Train Related?

 

开云体育

Hi Gang:

I spotted this Lathe on Ebay:


item #175364629061

While I know this is a toy train group and not generally interested in Machine Shop stuff, did you notice why this might be train related?

Look at the end of the red bed.

If you look harder, you will see the photos are of two totally different lathes??

Carl.
Re: Unimat 3 Headstock Pulley Plastic & Aluminium (Toothed belt caution)

 

Hello:


On Sun, Aug 7, 2022 at 04:09 AM, Bob T wrote:
... some mods to the lead screw as well ... ? ?? ?????????????????????????????????????????????????????????????? ? ? ? ???????????????????????????????????????????????????????????????????????????????????? ... needed a direction reversal as well I changed the lead screw to normal direction ... ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?????? ... ended up with a LH and a RH threaded leadscrew and matching carriage bushes.
Interesting and nicely done.? 8^)
Your photos clearly illustrate the issue of the lack of meat in the section of the carriage that holds the lead screw thread.

A question if I may:
Why the two lead screws instead of a reversible DC motor?

Thank you for taking the time to post your photos.
Much appreciated.

Best,

JHM
Re: Dial indicator holder for Unimat SL DB #db200

 

My suggestion is to make it clamp across both bars.? At times Ebay seller hkoesnadi has made these from machined aluminum as a cross bed clamp.? If you can make yours strong enough, it should also help dampen bed vibration.
Dial indicator holder for Unimat SL DB #db200

Bill's Workbench
 

Hello everyone, first-time poster and very new to Unimat stuff.
I created a 3D printable dial-indicator holder for my Unimat and thought I would share it. You can find it here:?

It works pretty well, and I am happy with the design. As I am very new to this Unimat and lathe stuff, please let me know if you have any suggestions to make it better.

You can check out my many adventures in with the Unimat (unboxing video coming 8/13/2022) with videos posted Saturday morning, Pacific time. Just like the good old days when you got up for Saturday morning cartoons.?
Re: Unimat 3 Headstock Pulley Plastic & Aluminium (Toothed belt caution)

 

I did some mods to the lead screw as well (I used a couple of mecano gears and a chain drive to the lead screw for threading). Because I needed a direction reversal as well I changed the lead screw to normal direction (RH thread) instead of the normal LH thread I had to bush out the carriage internal thread. So I ended up with a LH and a RH threaded leadscrew and matching carriage bushes.?

Note the clamp to adjust the backlash / play in the leadscrew drive.

?

The carriage bushing is almost a push fit with a tiny cap screw to secure it.

?

The clamp comes from a large clock if I remember correctly. The bush is "oilite"

I hope that this helps

Regards Bob
Re: Unimat 3 Headstock Pulley Plastic & Aluminium (Toothed belt caution)

 

Hello:

Sorry to revive a year old thread but there does not seem to be an option to send a PM to another member.


On Tue, Jun 1, 2021 at 03:15 AM, Clive wrote:

... converted the leadscrew from the 1mm pitch 60 degree screw thread to a 2mm pitch ACME-type thread, driving a Delrin carriage nut, and fitted thrust bearings to both lead-screw and cross-slide to eliminate the inherent backlash.
I have been looking at different options to try to fix the severe carriage backlash problem the U3 has albeit without having to perform major surgery on the lathe.

The simplest one I have seen is one, posted on the UK forum.
But here's the thing: it requires very precise drilling/milling to get that bronze nut installed at the correct position.
ie: not only at the correct height but the nut's x and z axes must also be perfectly parallel to the respective x and z axes on the U3.?

Drilling out the M8x1.0 threads is the easy part, it could be done with little risk using an .
You start off at the M8x1 drill size (M7) and slowly expand the reamer till you clean up all the internal threads.?

It's the transversal hole for mounting the cylindrical nut I worry about.
Enco really skimped on materials here.
The piece of metal that holds the carriage feed thread could not have been made smaller/thinner.

Makes me wonder what these guys were thinking when they drew up the plans for the carriage and the feed.
Why not make an easily replaceable bolt on part?
Something like the slide feed arrangement, another bad design but at least a new nut can be installed or made.

Incredible ...
But I digress.

I'd appreciate your posting the details of the modification you practised on your U3 so I can get an idea of what could be done.
A couple of photos would be nice.? 8^)

Thanks in advance.

Best regards,
JHM
Re: Alternative motor for the Unimat SL

 

My 150W motors came with flats on them. I used the Unimat as a drill press and drilled and tapped a set in the center of a spare? Unimat lathe pulleys.
?Jeff


-----Original Message-----
From: sawbona@...
To: OldToolmaker <old_toolmaker@...>; [email protected]
Sent: Fri, Aug 5, 2022 2:31 pm
Subject: Re: [Unimat] Alternative motor for the Unimat SL

Hello:

On Tue, Jun 28, 2022 at 09:09 AM, OldToolmaker wrote:
... used for the first time one of my Unimats with the 24 volt motor conversion.
My new motor finally showed up.
Contrary to what I expected, the ~ US$22.00 paid for shipping had it shipped on 23/06 and arrive on 14/07, just three weeks which is quite reasonable.
It must weigh over 500 grs. and shipping it over 20.000 km is not cheap these days.
The time from its arrival and it getting home to me (04/08) was customs/PO delays ...? 8^°

Here it is:





Specs:
Length: 80.5 mm / 92.5
Diameter: 52.0 mm
Shaft length / diameter: ? 20.5 mm / 8.0 mm?

The two pairs of M3 mounting holes are 35.0 mm apart and at right angles to each other.

... to make a new motor pulley and to drill and tap a set screw ...
I ordered a ER11A spindle for the shaft but made a mistake with the size, ordering the ER11-3 instead of the ER11-8.
So now I have to see how to turn a 3.0 mm shaft hole into an 8.0 mm shaft hole.
Material seems to be hard, so it won't be too easy.

Another issue I have is the existing pulley: it has no set screws and the motor's spindle has no flat ground into it.

I'd appreciate some indication of a proper solution on how to solve this for the time being.

I want to keep the original pulley so it will be (to start off) on duty at Unimat the I have refurbished.
I would eventually make another pulley to use with this new motor and if the U3 motor proves to be too weak for the milling table, I'll just get another one of these and sell the original U3 motor.

Thanks in advance.

Best,

JHM

steady rests

Jarod
 

I am wondering if there is a different offset in earlier models. They are so expensive I would hate to find out after purchased. The camera angle on the ones I see available seem deceptive.
Re: Milling with the DB 200

 

I ordered a 2 1/2"? 1/4" hole? 0-50 graduated handwheel from Sherline.? It is $16.38 + $4 shipping.? At this price, there is no need to be searching and dicking around with anything else.? They also have the smaller handwheels and those with adjustable collars which might be of use to someone here making a project.
Re: Alternative motor for the Unimat SL

 

Hello:


On Tue, Jun 28, 2022 at 09:09 AM, OldToolmaker wrote:
... used for the first time one of my Unimats with the 24 volt motor conversion.
My new motor finally showed up.
Contrary to what I expected, the ~ US$22.00 paid for shipping had it shipped on 23/06 and arrive on 14/07, just three weeks which is quite reasonable.
It must weigh over 500 grs. and shipping it over 20.000 km is not cheap these days.
The time from its arrival and it getting home to me (04/08) was customs/PO delays ...? 8^°

Here it is:





Specs:
Length: 80.5 mm / 92.5
Diameter: 52.0 mm
Shaft length / diameter: ? 20.5 mm / 8.0 mm?

The two pairs of M3 mounting holes are 35.0 mm apart and at right angles to each other.

... to make a new motor pulley and to drill and tap a set screw ...
I ordered a ER11A spindle for the shaft but made a mistake with the size, ordering the ER11-3 instead of the ER11-8.
So now I have to see how to turn a 3.0 mm shaft hole into an 8.0 mm shaft hole.
Material seems to be hard, so it won't be too easy.

Another issue I have is the existing pulley: it has no set screws and the motor's spindle has no flat ground into it.

I'd appreciate some indication of a proper solution on how to solve this for the time being.

I want to keep the original pulley so it will be (to start off) on duty at Unimat the I have refurbished.
I would eventually make another pulley to use with this new motor and if the U3 motor proves to be too weak for the milling table, I'll just get another one of these and sell the original U3 motor.

Thanks in advance.

Best,

JHM
Re: Milling with the DB 200

 

开云体育

Hi John:

I would look in my junk box, I do have a 100 graduated dial from Hardinge.

Then there is McMaster-Carr:

Or Misumi:

Or you could print one on paper or 3D print one.

Carl.

On 8/3/2022 12:51 PM, John Hutnick wrote:

There have been discussions/comments about difficulties aligning the head vertically.? The attached photo shows my current attempt to handle this.? It is based on the use of what are generally called a "flange support for linear guide rail 25mm" which can be found online and at Ebay.? I use 3 of these brackets: top, bottom, and head support.? The threaded rod is 8mm x 1.25 from True Value.? The ends of this 8mm can be just turned down to 1/4".? I tapped a tight bushing for this which is attached to the center flange.? I made a block of aluminum, screwed it to the center flange with two 8x32 screws.? This block protrudes up into the Unimat head support arm, and is fastened with a 10x24 from each side.
Does anyone know of a reasonably priced knob graduated in 50 to use on my 1/4" shaft on top?? Don't tell me to make it.

Re: Milling with the DB 200

 

开云体育

I believe Sherline knobs fit 1/4" shafts, you might find used ones on Ebay if someone has upgraded to ones with adjustable scales.? Replacement knobs are available from Sherline or Taig for cross slide, but have not researched prices.

Chuck Daldry

On 8/3/22 10:51, John Hutnick wrote:

There have been discussions/comments about difficulties aligning the head vertically.? The attached photo shows my current attempt to handle this.? It is based on the use of what are generally called a "flange support for linear guide rail 25mm" which can be found online and at Ebay.? I use 3 of these brackets: top, bottom, and head support.? The threaded rod is 8mm x 1.25 from True Value.? The ends of this 8mm can be just turned down to 1/4".? I tapped a tight bushing for this which is attached to the center flange.? I made a block of aluminum, screwed it to the center flange with two 8x32 screws.? This block protrudes up into the Unimat head support arm, and is fastened with a 10x24 from each side.
Does anyone know of a reasonably priced knob graduated in 50 to use on my 1/4" shaft on top?? Don't tell me to make it.

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