Re: Sewing Machine Motor w/foot pedal?
Have you searched in this motor manufactures database? Check out https://www.globalspec.com/industrial-directory/smallest_3-phase_induction_motors
It may require a little searching but they have ALL the motors from around the world! ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Carl
Sent: Thursday, September 02, 2021 4:23 PM
To: [email protected]; keithsangus@...
Subject: Re: [Unimat] Sewing Machine Motor w/foot pedal?? Hi Gang: My "big" lathe is a Smithy Granite and it uses a variable power supply for speed control. It works OK, a knob that takes the spindle from 100 rpm to about 1600. The machine does have three belt changes that I use when turning slow. The slow belt was an add on that was worth the money, before the "medium" setting would often stall at slow speeds. Some day I plan to replace the DC motor with a 3 phase AC motor and a Variable Frequency Drive (VFD). That will give me full torque at any speed. I'll still use the belt changes too. I haven't seen any 3 phase motors small enough for the Unimat, but perhaps a stepper motor / stepper drive?? Carl. On 9/2/2021 3:40 PM, Keith S. Angus wrote: I don't think the pedal gives any advantage when turning. It's just another thing to go wrong, and I'm not sure what the motor charcteristics are like when running at less than full speed. Changing speeds with the belts is much better as the available torque matches the speed - more or less constant power is available. I've only seen one type of lathe the used variable speed while turning - as opposed to changing speeds between cuts. That was turning contact lenses from acrylic, and only went from 3000 - 6000 rpm. It still didn't solve the problem of what to do when turning at zero radius.
In general I would say - keep it simple. If you need a new motor, maybe one from a sewing machine will work, but why bother with the variable speed? I have quite an elaborate variable speed unit powering my lathes, using 24 V DC motors. i never use it. I just swap the belts around.
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Re: Sewing Machine Motor w/foot pedal?
24v dc motor, 24v power supply, and a variable speed controller.? More power the the original motor, 150w and cheap. Easy to do. I have posted in the past the simple schematic and photos.?
?Jeff
-----Original Message-----
From: ddmckee54@...
To: Carl <carl.blum@...>; [email protected]
Sent: Thu, Sep 2, 2021 5:51 pm
Subject: Re: [Unimat] Sewing Machine Motor w/foot pedal?
A stepper would be great at low rpms, but wouldn't cut it at high rpms. They run out of torque as their speed increases.? A servo motor would be a good fit for both high and low rpm, but would definitely be overkill on a Unimat.? There are hybrid servo/stepper motors, I'm not sure what rpm they would top out at though, maybe 3-4K rpm, if that?? And remember that both a stepper motor and a servo motor will require a driver of some type, along with the motor.
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Re: Sewing Machine Motor w/foot pedal?
A stepper would be great at low rpms, but wouldn't cut it at high rpms. They run out of torque as their speed increases.? A servo motor would be a good fit for both high and low rpm, but would definitely be overkill on a Unimat.? There are hybrid servo/stepper motors, I'm not sure what rpm they would top out at though, maybe 3-4K rpm, if that?? And remember that both a stepper motor and a servo motor will require a driver of some type, along with the motor.
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Re: Sewing Machine Motor w/foot pedal?
Hi
Gang:
My
"big" lathe is a Smithy Granite and it uses a variable power
supply for speed control. It works OK, a knob that takes the
spindle from 100 rpm to about 1600. The machine does have
three belt changes that I use when turning slow. The slow belt
was an add on that was worth the money, before the "medium"
setting would often stall at slow speeds.
Some
day I plan to replace the DC motor with a 3 phase AC motor and
a Variable Frequency Drive (VFD). That will give me full
torque at any speed. I'll still use the belt changes too.
I
haven't seen any 3 phase motors small enough for the
Unimat, but perhaps a stepper motor / stepper drive??
Carl.
On 9/2/2021 3:40 PM, Keith S. Angus
wrote:
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I don't think the pedal gives any advantage when turning. It's
just another thing to go wrong, and I'm not sure what the motor
charcteristics are like when running at less than full speed.
Changing speeds with the belts is much better as the available
torque matches the speed - more or less constant power is
available. I've only seen one type of lathe the used variable
speed while turning - as opposed to changing speeds between cuts.
That was turning contact lenses from acrylic, and only went from
3000 - 6000 rpm. It still didn't solve the problem of what to do
when turning at zero radius.
In general I would say - keep it simple. If you need a new motor,
maybe one from a sewing machine will work, but why bother with the
variable speed? I have quite an elaborate variable speed unit
powering my lathes, using 24 V DC motors. i never use it. I just
swap the belts around.
|
Re: Sewing Machine Motor w/foot pedal?
I don't think the pedal gives any advantage when turning. It's just another thing to go wrong, and I'm not sure what the motor charcteristics are like when running at less than full speed. Changing speeds with the belts is much better as the available torque matches the speed - more or less constant power is available. I've only seen one type of lathe the used variable speed while turning - as opposed to changing speeds between cuts. That was turning contact lenses from acrylic, and only went from 3000 - 6000 rpm. It still didn't solve the problem of what to do when turning at zero radius.
In general I would say - keep it simple. If you need a new motor, maybe one from a sewing machine will work, but why bother with the variable speed? I have quite an elaborate variable speed unit powering my lathes, using 24 V DC motors. i never use it. I just swap the belts around.
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Re: Sewing Machine Motor w/foot pedal?
>One obvious answer, if there is a wiring diagram on the motor, it is fine to run it ccw.
Let me clarify, Ifthere is CCW instruction / label on the motor, so I know I can reverse the motor for a different position for a lathe.
Tamra
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Re: Sewing Machine Motor w/foot pedal?
I understand a motor running clockwise and counterclockwise in its wiring diagram... but how do you know by looking at the motor that you can run it counterclockwise??
One obvious answer, if there is a wiring diagram on the motor, it is fine to run it ccw.? But what happens to a motor if you reverse the motor to CCW and the mfg didn't intend for you to do this?
I have 4 sewing machines - 3 are singer sewing machines and there are no wiring diagrams on my singers; I would never take my 2 featherweight(s) apart though.? But my other singer could be sacrificed in theory.? All my sewing machines are UK models, I know that some featherweights were mfg in the UK, and they have different motors then the US Model.
Tamra
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Re: Sewing Machine Motor w/foot pedal?
This is something that I've been thinking about myself, as I have been offered my Mum's sewing machine for the motor (the rest is worn out I believe). Make and model unknown until I pick it up, possibly next week. However, I believe that sewing machine motors would need rewiring as they run in the opposite direction to the Unimat motor, unless mounted on the 'wrong' side of the motor mount.
Paul B, Derbyshire UK.
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Re: Sewing Machine Motor w/foot pedal?
Do you mean the Uni sagging under load, or holding yoiur foot in the right spot to keep a steady speed?
If it's hte former that is worrying you, there's not much you can do about it without adding some fairly sophisticated electronics into hte mix.? If it's the latter, that's got a simple answer.?
Usually the foot pedal is linked to a pot inside the foot pedal unit with a spring to hold the pedal up.? Just take the foot pedal apart and install the electrical guts in a small box.? Get the appropriate knob for the pot and you now have a speed control that will stay where you put it.?
Don
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Re: Sewing Machine Motor w/foot pedal?
Hello:
I've
used a foot speed control with my Unimat motor. Using your
foot you can increase the voltage as you load the tool. Just
remember, half the voltage produces less than half the power
at the motor. Using the belts is the best way to slow the work
down.
Carl.
On 9/1/2021 9:05 AM, OldToolmaker via
groups.io wrote:
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Anyone here have experience with using a sewing machine motor and
foot speed control on the Unimat? I am thinking of getting one.
The only issue I see is maintaining constant speed.
?Thanks?
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Sewing Machine Motor w/foot pedal?
Anyone here have experience with using a sewing machine motor and foot speed control on the Unimat? I am thinking of getting one. The only issue I see is maintaining constant speed.
?Thanks?
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http://www.homemadetools.net/forum/?OFF-SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
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John H, it is my experience that the Unimats all have different color paint, and the group has posted even in the same generation the color differs.
I would suggest calling paint stores and asking if they will color match for you and add the hammered paint "fleck" and then ask if they will put it in a spray can for you.
I don't think I can airbrush paint with the hammered paint fleck through my equipment.
My DB color is different from my SL.? Well actually my SL has a DB-200 badge on it, but it is a zamac base (non magnetic) so in my opinion my first DB200 is actually an SL, but my cast iron Unimat is a different color, there are many shade of paint for our unimats...we would have to have a uni - convention and get them all together - like a car show for photos.
From the photos posted, I think Andy's motor is from an SL - because of the color.? The motor could have been from a DB200 like mine, but clearly they are painted two different colors.
Tamra
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Earlier today I talked to Rustoleum, they discontinued Hammered Rosemary quite some time ago.? Any website in the US that still lists it, like toolsupply.com and Home Depot, probably just haven't updated their websites to eliminate that product.
I remember there was quite the buying frenzy around here when people would identify a location as still having some on the shelf.? There were never any within what I considered a reasonabble range, or I would have participated in it.
Don
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The quoted information may be out date.? Toolboxsupply shows this paint "out of stock".? Home Depot shows other Rustoleum hammered spray paint in 6 packs, but not rosemary.? Grainger shows the hammered paints, but not rosemary.
On Fri, Aug 20, 2021 at 12:30 PM james Pineda via <james_h_pineda= [email protected]> wrote:
Hammered Rosemary is available in the US in?single cans from Toolboxsupply.com (NY state) and in 6 can boxes from Home Depot. Grainier probably carries it as well.? Local and regional art supply houses that stock large inventories of spray paints are worth checking out. Auto paint supply houses can probably color match and mix as many spray cans as you require. James On Thursday, August 19, 2021, 4:57 PM, Richard Burrows <bluerandonee@...> wrote: See a complete list of name tags here:
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Rust-Oleum stopped making Rosemary a few years ago. I got lucky and picked up a couple of cans from Home Depot when the got rid of it in a clearance sale.
?Jeff
-----Original Message-----
From: james Pineda via groups.io <james_h_pineda@...>
To: [email protected]; bluerandonee@...
Sent: Fri, Aug 20, 2021 12:30 pm
Subject: Re: [Unimat] Unimat color
Hammered Rosemary is available in the US in?single cans from Toolboxsupply.com (NY state) and in 6 can boxes from Home Depot. Grainier probably carries it as well. ?Local and regional art supply houses that stock large inventories of spray paints are worth checking out. Auto paint supply houses can probably color match and mix as many spray cans as you require.
James
On Thursday, August 19, 2021, 4:57 PM, Richard Burrows <bluerandonee@...> wrote:
See a complete list of name tags here:
http://www.lathes.co.uk/unimat/page8.html
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Hammered Rosemary is available in the US in?single cans from Toolboxsupply.com (NY state) and in 6 can boxes from Home Depot. Grainier probably carries it as well. ?Local and regional art supply houses that stock large inventories of spray paints are worth checking out. Auto paint supply houses can probably color match and mix as many spray cans as you require.
On Thursday, August 19, 2021, 4:57 PM, Richard Burrows <bluerandonee@...> wrote: See a complete list of name tags here:
http://www.lathes.co.uk/unimat/page8.html
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Thank you.? I am asking for more specific knowledge than is noted in .. I had previously stated that I considered that site description to be a generality for colors - but very useful otherwise.? Can anyone help by showing examples of each color on different models by year and with photos?? Obviously we know that the first model was black crackle.? Late models are all hammered green.? So it would be good to know specifics on everything in between.? Or has it come down to only saving photos of whatever shows up on Ebay?
It should be a Mk 2B, and in the link you can read "...Colours, as ever, pose a problem and instead of a single, standard finish crackle-black (see lower down this page) examples have been found in a light plain (flat) grey and others in either silver-blue or silver grey - with the latter two in a "hammer-effect" paint.."
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This had been discussed some time ago.? Note that Canadian Tire still have in stock at many branches Rustoleum Hammered spray paint in rosemary color.? Their site shows you which store has what quantity.? A long time ago when Home Depot had this color it was said to be the closest to Unimat green.? I do not find it available in the US.
On Fri, Aug 20, 2021 at 8:18 AM OldToolmaker via <old_toolmaker= [email protected]> wrote: There used to be an eBay seller who sold small bottles of paint for Unimat. I have not seen anything on EBay lately. I am always watching so I would know.
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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
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There used to be an eBay seller who sold small bottles of paint for Unimat. I have not seen anything on EBay lately. I am always watching so I would know.
--
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
|
See a complete list of name tags here:
http://www.lathes.co.uk/unimat/page8.html
|
Carl
Tamra
OldToolmaker