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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^¡ã

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^¡ã

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

 

¿ªÔÆÌåÓý

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

 

¿ªÔÆÌåÓý

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.

Re: Milling with the DB 200

 

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.

20220803_122112.jpg

FYI: site:craigslist.org unimat

 



---------- Forwarded message ---------
$1,000. Central LA. Is 220 volt but has transformer.

Neil

site: unimat
As-it-happens update ? July 31, 2022
WEB
Emco unimat 3 lathe + mill + power-feed + accessories. Used but in good working condition. Includes motors for both the lathe and mill so that?...
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Re: Wheels

 

Ello

so this video goes over that in a bit of detail?

but more or less, if the plastic handles are from the unit itself, its one of the last two vers released, however there are also sellers putting cheap looking plastic handles on units they found to make them "useable" and try to sell them for more?
Wheels

Jarod
 

I am wondering what is the difference between machines with plastics vs. metal hand wheels. Production time or place?
-Jarod
Re: off topic question repowering

 

¿ªÔÆÌåÓý

Hi Gang:

The other important fact is the voltage drop for a given amperage is the same no matter what voltage you start at. So a 3 volt drop at 12 volt is a bigger problem than at 120 volts.

So 18AWG wire can pass 1100 watts at 110 volts, but 2200 watts at 220 volts.

Also remember we are talking about a motor for Unimat lathe, that has the rigidity to take maybe a 200 watt cut.

Carl.

According to the NEC information that I found, 18AWG fixture wire has an allowable ampacity of 10 amps, and the allowable ampacity of 16AWG fixture wire is 13 amps.

Doing the voltage drop calculations, using the maximum allowable voltage drop of 3%, 110 volts supply voltage, and your load of 6 amps - the maximum length of the 18AWG fixture wire is 34'.? Any longer and you exceed the 3% allowable drop.? With 16AWG and the same conditions, the maximum length is 55'.

Don?

Re: off topic question repowering

 

¿ªÔÆÌåÓý

Good Evening Don,

?

The original question dealt with voltage drop on a 24 volt line. (See original question below.)

?

The voltage drop for a length of wire is dependent on its length, the current through it, the size of the wire, and the wire¡¯s material.? All other things being equal, the length of wire that will give you a 3% voltage drop for a given current through it will be about 22% for a supply voltage of 24 volts instead of 110 volts? ((24 / 110) x 100).? Therefore, using the numbers you supplied (and assuming they were for the supply plus the return lengths of wire), one would be limited to 7.5 feet of 18 gauge wire or 12.1 feet of 16 gauge wire. ?

?

I don¡¯t know what on-line table or calculator you used, but one also needs to be careful when doing these types of calculations to recognize if the cable is in free air or in a conduit.? Wires in a conduit will have a more restrictive rating than those in free air because any heat generated in the wire will be trapped with the conduit.? ??

?

Jerry F.

?

ORIGINAL QUESTION: ¡°Hello all. Back again with another simple question. What american (sic) wire gauge sized wire size should I use to connect the 110-120v to th 24v out converter box, thence to the speed controller and finally to the motor itself. The scooter motor wire looks to be 16 awg or so. My rudimentary knowledge of electrics tell me that watts/voltage= amperage or 150W/24V= 6A in round numbers. From tables on line it appears that 18awg should be more than adequate. Is that reasonable?¡±

?

From: [email protected] [mailto:[email protected]] On Behalf Of ddmckee54@...
Sent: Wednesday, July 27, 2022 8:08 AM
To: Gerald Feldman; [email protected]
Subject: Re: [Unimat] off topic question repowering

?

According to the NEC information that I found, 18AWG fixture wire has an allowable ampacity of 10 amps, and the allowable ampacity of 16AWG fixture wire is 13 amps.

Doing the voltage drop calculations, using the maximum allowable voltage drop of 3%, 110 volts supply voltage, and your load of 6 amps - the maximum length of the 18AWG fixture wire is 34'.? Any longer and you exceed the 3% allowable drop.? With 16AWG and the same conditions, the maximum length is 55'.

Don?

Re: Overall Performance of Unimat 3

 

And for those who have a 3D printer, files to print Module 1 change gears for the 7x mini-lathes are available on Thingiverse.com, and probably elsewhere.?

The Smithy CB-1220XL 3-in-1 machine my brother bought for me also uses Module 1 change gears, but they have a different style of hub.?

Bill in OKC

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better



On Thursday, July 28, 2022 at 04:40:43 PM CDT, OldToolmaker via groups.io <old_toolmaker@...> wrote:


The 7¡± minilathe also uses module 1 plastic change gears which are readily available.?
Dick

Re: Overall Performance of Unimat 3

 

The 7¡± minilathe also uses module 1 plastic change gears which are readily available.?
Dick
Re: Overall Performance of Unimat 3

 

On Thu, Jul 28, 2022 at 04:23 AM, Mike Gidley wrote:
I have the equivalent as a ready made item. I realised that more pitches become possible if you can use a first gear with 24 teeth instead of 25, plus the use of a compound gear in the train. I was thinking of less usual (metric) pitches like 0.75 mm, and ones below 0.5 mm. Then I realised I've never used it for any thread cutting, so I stopped worrying bout it! 1 Mod gears are widely available in plastic, brass and steel. The pitch is used for some sets of cheap gears for kids, and some are offered as spares for RC cars.
Re: Overall Performance of Unimat 3

 

If you go here:


Then go to Google book links you might find some interesting stuff to browse.

Neil
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