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That should be OK to get you the 240 volts you need.?
A full wave bridge and a 350 VDC capacitor will convert this to DC.
A speed control for this will be tricky however. Was that in your plans?
Hi,
Can anyone help me determine how to wire this motor up to use on a Uninmat SL please.
I have just been given this motor it is said to have come off a small lathe and that is all we know.
I see It needs DC to power it but the 220vDC is where I am lost, what would I need to drive/control it?
Thanks Phill
|
SIEG is the group that makes the Harbor Freight, and many other brands, mini lathes. They use a tri-ac voltage & speed controller. You might contact ArcEurotrade or Little Machine Shop, depending on your location. LMS is in the US, ArcEurotrade in the UK, IIRC. My mini-lathe use a 180vdc card, 120vac power supply, made for the US market.I have bought a couple of small items from ArcEurotrade, and more stuff from LMS, both are, in my experience, good folks to deal with.?
HTH!
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!
Expect in one hand, expectorate in the other. See which one gets full first.
On Tuesday, July 18, 2023 at 08:23:24 AM CDT, phill005 via groups.io <phill05@...> wrote:
Hi Bill, Been advised it's see below, I have been playing with a 24v DC motor and controller but I am getting it shut down as the speed increases so I don't know what is wrong on that, A friend called in this morning and I was telling him about the shutting down and he came up with the 220vDC motor and say's try this, anyway been ringing round a few friends and we found this info for it. But still no wiser yet how to power it up, but will look into what you say Bill, many thanks. Phill
SIEG C2-150 Motor
250W Brushed DC Motor - Type ZYT-250.
Dimensions:
¡¤???????? Body Length: 145mm
¡¤???????? Body Diameter: 83mm
¡¤???????? Fixing is via two M6 threaded holes in body on 30mm centres.
¡¤???????? Speed: 5000 RPM
¡¤???????? Power: 250W
¡¤???????? Voltage: 220VDC
¡¤???????? Current: 2A
¡¤???????? Drive Shaft: ?8 x 22mm with 3mm wide key and 2 circlip grooves.
|
Re: Needle bearing WW Spindle
A quick google search will offer up a plethora of sources:
| |
toggle quoted message
Show quoted text
On Jul 18, 2023, at 12:25 PM, Andrei <calciu1@...> wrote:
?
Check SKF or Timken. They make a boatload of bearings.?
I just brought in a watchmakers spindle. ?It¡¯s tight and rough. ?Disassembly revealed damaged needle bearing retaining ring. ??
Has anyone sourced a replacement bearing? ?
Original is an INA?00/R2 RNA-NA 4903 ? AC 152.?
I agree PWM is preferable. For intermittent use like on a hobby lathe, I have used the inexpensive power supplies successfully.? This mostly applies to manual work.? The on and off of cut-check-cut-change tool etc usually is ample time to cool down the motor a bit.
Now CNC motors are a whole different animal.? They run continuous for potentially an hour or more.? I would not recommend any cheap power supplies for that application.
Tool247: You are partially correct, the maximum speed is limited by the available voltage, but as the voltage drops the current demand rises to do the same amount of work so the motor will heat up which may then destroy the motor. Speed on a DC motor is best controlled by pulsing the manufacturer specified voltage on and off rapidly (50khz+) and varying time ratio of time the voltage is on verses off in each cycle, the more time the voltage is on vs off per cycle the faster the motor will run and vice versa. Since the motor is always being supplied the maximum voltage, but only for a limited time in each cycle, the current demand is optimized and the motor does not overheat. This process is known as Pulse Width Modulation (PWM), if you would like more detail check this URL:
.
Richard.
|
Re: Needle bearing WW Spindle
Check SKF or Timken. They make a boatload of bearings.?
toggle quoted message
Show quoted text
I just brought in a watchmakers spindle. ?It¡¯s tight and rough. ?Disassembly revealed damaged needle bearing retaining ring. ??
Has anyone sourced a replacement bearing? ?
Original is an INA?00/R2 RNA-NA 4903 ? AC 152.?
|
Tool247: You are partially correct, the maximum speed is limited by the available voltage, but as the voltage drops the current demand rises to do the same amount of work so the motor will heat up which may then destroy the motor. Speed on a DC motor is best controlled by pulsing the manufacturer specified voltage on and off rapidly (50khz+) and varying time ratio of time the voltage is on verses off in each cycle, the more time the voltage is on vs off per cycle the faster the motor will run and vice versa. Since the motor is always being supplied the maximum voltage, but only for a limited time in each cycle, the current demand is optimized and the motor does not overheat. This process is known as Pulse Width Modulation (PWM), if you would like more detail check this URL: https://www.electronics-tutorials.ws/blog/pulse-width-modulation.html. Richard.
|
Needle bearing WW Spindle
I just brought in a watchmakers spindle. ?It¡¯s tight and rough. ?Disassembly revealed damaged needle bearing retaining ring. ??
Has anyone sourced a replacement bearing? ?
Original is an INA?00/R2 RNA-NA 4903 ? AC 152.?
|
I have a Unimat 4 and the power stopped working. Control board failed. Motor is 200V DC.
I bought from ebay a 200V DC power supply and connected to this motor works fine.
Gives constant voltage and same as u3 speed change is via pulleys.
Search ebay for 200V DC motor controllers and you should find something suitable.
On Tue, 18 Jul 2023 at 14:56, Tool247 <Sjkochan@...> wrote: Looks like that says 240W on it. Watts = Volts x Amps. So for a 220v dc output, it requires approx 1.1 Amps draw.
The power supply below is for a 60v 480w DC output with 8 Amps.
That power supply has 2x the power capability.? It handles up to around 8x the amp draw of that motor. The only downside is that in DC motors if you vary the voltage you vary the speed. So to get to max speed on that motor you need 200+ volts output.? At 60v you would be at around 30% of the full speed. That power supply has a rheostat knob for speed control, so you would be able to run the motor from 0-30% full speed. Based on the motor max speed, it might be like 4000 or 6000 so 30% might be perfect for a small lathe.
?.....or look for a cheap 48 or 60v DC motor and wire it to run full capacity with the supply below.? It costs around $46.? Cheap for a variable speed controller.
Hi,
Can anyone help me determine how to wire this motor up to use on a Uninmat SL please.
I have just been given this motor it is said to have come off a small lathe and that is all we know.
I see It needs DC to power it but the 220vDC is where I am lost, what would I need to drive/control it?
Thanks Phill
|
Looks like that says 240W on it. Watts = Volts x Amps. So for a 220v dc output, it requires approx 1.1 Amps draw.
The power supply below is for a 60v 480w DC output with 8 Amps.
That power supply has 2x the power capability.? It handles up to around 8x the amp draw of that motor. The only downside is that in DC motors if you vary the voltage you vary the speed. So to get to max speed on that motor you need 200+ volts output.? At 60v you would be at around 30% of the full speed. That power supply has a rheostat knob for speed control, so you would be able to run the motor from 0-30% full speed. Based on the motor max speed, it might be like 4000 or 6000 so 30% might be perfect for a small lathe.
?.....or look for a cheap 48 or 60v DC motor and wire it to run full capacity with the supply below.? It costs around $46.? Cheap for a variable speed controller.
Hi,
Can anyone help me determine how to wire this motor up to use on a Uninmat SL please.
I have just been given this motor it is said to have come off a small lathe and that is all we know.
I see It needs DC to power it but the 220vDC is where I am lost, what would I need to drive/control it?
Thanks Phill
|
Hello Carl,
I am in the UK so have 230-250v AC power, we have found the lathe (now discontinued) and the controller? at?
But it has a hefty price on it so think will be looking at a different way to power it, been looking in the spares box and I have some rectifiers and other parts so guess it's time to sort through them and see if I can get a working motor.
Many thanks
Phill
|
The label reads 220V DC, not AC. ?(Yes Uk and Europe domestic mains is 220-250V AC.)
toggle quoted message
Show quoted text
On 18 Jul 2023, at 14:13, Carl <carl.blum@...> wrote:
?
Hello
Phill:
Do you
have 220 volt power in your shop? This motor may have come
from Europe where 220 is standard. If you don't, there are
"step up" transformers you could use, I would look for a 220
variable transformer with a 120 center tap. With a bridge
rectifier this would give you a speed control with just a few
parts.
The
other option is a transistor power supply that could provide
pulse power with better low speed torque.
Carl.
On 7/18/2023 8:08 AM, phill005 via
groups.io wrote:
Hi,
Can anyone help me determine how to wire this motor up to use on a
Uninmat SL please.
I have just been given this motor it is said to have come off a
small lathe and that is all we know.
I see It needs DC to power it but the 220vDC is where I am lost,
what would I need to drive/control it?
Thanks Phill
|
Hi Bill, Been advised it's see below, I have been playing with a 24v DC motor and controller but I am getting it shut down as the speed increases so I don't know what is wrong on that, A friend called in this morning and I was telling him about the shutting down and he came up with the 220vDC motor and say's try this, anyway been ringing round a few friends and we found this info for it. But still no wiser yet how to power it up, but will look into what you say Bill, many thanks. Phill
SIEG C2-150 Motor
250W Brushed DC Motor - Type ZYT-250.
Dimensions:
¡¤???????? Body Length: 145mm
¡¤???????? Body Diameter: 83mm
¡¤???????? Fixing is via two M6 threaded holes in body on 30mm centres.
¡¤???????? Speed: 5000 RPM
¡¤???????? Power: 250W
¡¤???????? Voltage: 220VDC
¡¤???????? Current: 2A
¡¤???????? Drive Shaft: ?8 x 22mm with 3mm wide key and 2 circlip grooves.
|
Hello
Phill:
Do you
have 220 volt power in your shop? This motor may have come
from Europe where 220 is standard. If you don't, there are
"step up" transformers you could use, I would look for a 220
variable transformer with a 120 center tap. With a bridge
rectifier this would give you a speed control with just a few
parts.
The
other option is a transistor power supply that could provide
pulse power with better low speed torque.
Carl.
On 7/18/2023 8:08 AM, phill005 via
groups.io wrote:
toggle quoted message
Show quoted text
Hi,
Can anyone help me determine how to wire this motor up to use on a
Uninmat SL please.
I have just been given this motor it is said to have come off a
small lathe and that is all we know.
I see It needs DC to power it but the 220vDC is where I am lost,
what would I need to drive/control it?
Thanks Phill
|
If you're in Europe, you need a 220-240VDC power supply, or you could possibly run it from a rectifier, if such are available. Looks to me like it's pretty small, since the usual size of those connectors is 3/16th or 1/4 inches in width. You don't have anything in the photo to provide scale for comparison, otherwise. Personally, I've never see a DC motor rated for that high a voltage. I've also not seen a speed controller rated for that high a voltage. What I bought for mine was a 24vdc 150watt motor, the same one that Keith has mentioned, a 24vdc 7amp power supply, speed controller rated for up to 50 volts, and 24vdc cooling fans to fit the enclosures I bought. Haven't put them together yet, still working on clearing my workbench. And take SWMBO & myself to doctors...?
I've been several kinds of technician for electronic and mechanical equipment, and lived in Germany for several years, so have a clue about European power, but nothing specific to the UK... Your're going to need the amperage draw of the motor, so you can find a properly spec'ed rectifier, at least.?
If there's a hobby group near you, I'd ask for some help from them!??
Bill in OKC (nearly dead-center in the USA.)
William R. Meyers, MSgt, USAF(Ret.)
Aphorisms to live by: Good judgement comes from experience. Experience comes from bad judgement.? SEMPER GUMBY!
Expect in one hand, expectorate in the other. See which one gets full first.
On Tuesday, July 18, 2023 at 07:08:54 AM CDT, phill005 via groups.io <phill05@...> wrote:
Hi,
Can anyone help me determine how to wire this motor up to use on a Uninmat SL please.
I have just been given this motor it is said to have come off a small lathe and that is all we know.
I see It needs DC to power it but the 220vDC is where I am lost, what would I need to drive/control it?
Thanks Phill
|
Not my area of expertise but I suspect ¡°small¡± is a relative term! ?220VDC isn¡¯t something I would associate with hobby equipment.
Regards?
toggle quoted message
Show quoted text
On 18 Jul 2023, at 13:08, phill005 via groups.io <phill05@...> wrote:
?Hi, Can anyone help me determine how to wire this motor up to use on a Uninmat SL please. I have just been given this motor it is said to have come off a small lathe and that is all we know. I see It needs DC to power it but the 220vDC is where I am lost, what would I need to drive/control it? Thanks Phill
<IMG_20230718_1256579.jpg>
|
Hi,
Can anyone help me determine how to wire this motor up to use on a Uninmat SL please.
I have just been given this motor it is said to have come off a small lathe and that is all we know.
I see It needs DC to power it but the 220vDC is where I am lost, what would I need to drive/control it?
Thanks Phill
|
Re: Question for you guys that are tech savvy
You could always query the vendor to be extra sure.? But his drive belt page looks pretty clear to me.? He has a section for the DB/SL which would suggest they all use the same belts.? And another section for the Unimat 3.? Here is his belt ordering page:
Charles E. "Chuck" Kinzer
On Tuesday, July 18, 2023 at 02:13:39 AM PDT, Herman de Leeuw via groups.io <herman.deleeuw@...> wrote:
Just to be sure - will these belts equally serve the UNIMAT DB/SL as well as UNIMAT 3?
Op 15-07-2023 17:57 schreef Charles Kinzer <ckinzer@...>:
I got belts from Doug Feistamel at his site at
At the bottom of his home page, he describes his belts in detail saying they are polyurethane.? They happen to be orange, but it should be noted that the "industry standard" for O-Ring colors is not a hard and fast rule.? And the ones from Unimat-Vintage-Lathe don't seem to be a standard O-Ring anyway but a purpose designed belt that happens to look just like an O-Ring.
I consider these to be top quality belts.
I used to design instrumentation for deep ocean applications and used many O-Rings for sealing purposes.? There are many materials and "durometers" (hardness) and there are plenty that would not be suitable for a Unimat drive belt.? So, if you just buy some O-Ring, it might or might not be suitable.
Charles E. "Chuck" Kinzer
On Saturday, July 15, 2023 at 08:21:10 AM PDT, Jkle379184 via groups.io <jkle379184@...> wrote:
Ok, I am on a learning curve right now. It looks like the color is important, the industry uses the color of the O ring as a code to tell what it is made of. I got lucky years ago when I ordered the white ones. Here is a link to what the colors mean.
And here is data on the white ones that I have
If you do a web search of -334 or -339 Oring 70 Duro White FDA NBR you will find many sources for them.
Here is a data link for the black ones
Jeff
On Saturday, July 15, 2023 at 10:24:49 AM EDT, Jkle379184 via groups.io <jkle379184@...> wrote:
I got them on Ebay a few years ago, they are? a standard size O ring. I will check my notes to see if I wrote down the O ring sizes.
?Jeff
On Saturday, July 15, 2023 at 09:23:12 AM EDT, OldToolmaker via groups.io <old_toolmaker@...> wrote:
Hello Jeff,
Where do you purchase your white buna belts?
Dick
--
http://www.homemadetools.net/ forum/?OFF- SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
?MINI- LATHE CARRIAGE LOCK PLANS
?SMALL QC TOOL POST PLANS?
?QUICK CHANGE LATHE TURRET
?MINI LATHE COMPOUND PIVOT MODIFICATION
|
Re: Question for you guys that are tech savvy
Just to be sure - will these belts equally serve the UNIMAT DB/SL as well as UNIMAT 3?
Op 15-07-2023 17:57 schreef Charles Kinzer <ckinzer@...>:
I got belts from Doug Feistamel at his site at
At the bottom of his home page, he describes his belts in detail saying they are polyurethane.? They happen to be orange, but it should be noted that the "industry standard" for O-Ring colors is not a hard and fast rule.? And the ones from Unimat-Vintage-Lathe don't seem to be a standard O-Ring anyway but a purpose designed belt that happens to look just like an O-Ring.
I consider these to be top quality belts.
I used to design instrumentation for deep ocean applications and used many O-Rings for sealing purposes.? There are many materials and "durometers" (hardness) and there are plenty that would not be suitable for a Unimat drive belt.? So, if you just buy some O-Ring, it might or might not be suitable.
Charles E. "Chuck" Kinzer
On Saturday, July 15, 2023 at 08:21:10 AM PDT, Jkle379184 via groups.io <jkle379184@...> wrote:
Ok, I am on a learning curve right now. It looks like the color is important, the industry uses the color of the O ring as a code to tell what it is made of. I got lucky years ago when I ordered the white ones. Here is a link to what the colors mean.
And here is data on the white ones that I have
If you do a web search of -334 or -339 Oring 70 Duro White FDA NBR you will find many sources for them.
Here is a data link for the black ones
Jeff
On Saturday, July 15, 2023 at 10:24:49 AM EDT, Jkle379184 via groups.io <jkle379184@...> wrote:
I got them on Ebay a few years ago, they are? a standard size O ring. I will check my notes to see if I wrote down the O ring sizes.
?Jeff
On Saturday, July 15, 2023 at 09:23:12 AM EDT, OldToolmaker via groups.io <old_toolmaker@...> wrote:
Hello Jeff,
Where do you purchase your white buna belts?
Dick
--
http://www.homemadetools.net/ forum/?OFF- SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
?MINI- LATHE CARRIAGE LOCK PLANS
?SMALL QC TOOL POST PLANS?
?QUICK CHANGE LATHE TURRET
?MINI LATHE COMPOUND PIVOT MODIFICATION
|
Re: tailstock end of Unimat alloy bed...
The current inch definition is exactly 25.4mm. 254/2 is exactly
127. 127 is a prime number so an exact solution involves a 127
tooth gear.
127 is a lot of teeth for a gear. Depending on the diametrical
pitch this gear may be kinda large for a little lathe like a
Unimat.
80/63 works out to 1.269841 which is close enough to 1.27 that
you probably won't be able to measure the difference over short
distances.
On 7/17/23 13:50, Andrei wrote:
toggle quoted message
Show quoted text
I remember reading somewhere that a better transposing gear for
metric is 63/80.
You may want to research that a bit before committing to the
giant 127 tooth one.
As usual, your mileage may vary
Sounds like a good thing
I finally got a follower rest for my larger lathe, since I
can't seem to find M8x1 allthread. Looks like I either
need 127/120 tooth change gears, or taps and dies. Also
gotta check to see if the leadscrew is LH or RH
threaded... Looks like I found another rabbit hole to dive
down!
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.
Expect in one hand,
expectorate in the other. See which one gets
full first.
On Monday, July 17, 2023 at 10:17:54 AM CDT, g
steinback via groups.io
<gsteinba52@...> wrote:
The woodworking version was designed for hand-held
tools, and as you can see there is no feed screw!
Clearance may be an issue (along with many others) for
anyone wishing to add extended way bars.
|
Unimat DB 200 Mini Lathe, original chest. No motor. Seattle Craigslist. (Kent)
?
$450.?
Not sold by me. Use the link.?
|
Bill in OKC too
John Entwistle
Tool247
Carl
Herman de Leeuw