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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

 

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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

 

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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

 

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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
Re: Overall Performance of Unimat 3

 

That's been done BUT it winds up as a big box under the lathe so the horizontal feed can be geared to the headstock. Used to be advertised in Popular Mechanics etc. I think there's a link in one section.

Neil


On Wed., Jul. 27, 2022, 20:38 Pierre Burelle, <Pburelle@...> wrote:
Wow great job do you think this could be fitted on a sl / db ?lathe??
Re: Overall Performance of Unimat 3

 

¿ªÔÆÌåÓý

Wow great job do you think this could be fitted on a sl / db ?lathe? Did you upload the stl file so we could make our own set of gears¡­


On Jul 27, 2022, at 11:33 PM, Mike Gidley <mike.61dley@...> wrote:

?Forgot to mention I added a PDF of the design. In the last reply in case you missed it.

Re: Overall Performance of Unimat 3

 

Forgot to mention I added a PDF of the design. In the last reply in case you missed it.
Re: Overall Performance of Unimat 3

 

No Dick I cheated and 3D printed the Gears in PLA+.
They are Module 1 Metric gears.?

unimat3_threading_attachment.pdf
unimat3_threading_attachment.pdf

Re: Overall Performance of Unimat 3

 

Mike,
Awesome workmanship on your thread cutting attachment for the U3.
Did you cut your own gears?
Also, is there a thread cutting gear chart available for the attachment?
Thanks very much for the pictures!
Dick
Re: off topic question repowering

 

On Wed, Jul 27, 2022 at 04:07 PM, <ddmckee54@...> wrote:
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.
Since the motor is 150 W the current for the 110 V supply is only 1.36 A, call it 1? A, so quite light wire will do. I would use whatever is easy to use - sometimes a wire can be too thin to be practical. On the 24 V side the current will be 6.25 A maximum, so 10 amp wire will be fine. The motor will rarely, if ever, work at maximum power, and the cable run will be short, so it would probably be OK to use 6 A rated cable, and voltage drop will not be significant.
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