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It seems like the motor / speed control is a common issue with the 7" and 8" mini lathes, but I don't see many motor / speed control projects discussed.
I follow several different small lathe forums as I find info for one is often useful for another.
Motor swaps, are a common topic of discussion with other lathes from Unimats to 9x20.
Am I just not noticing this here, or is this just not a popular mod with these lathes for some reason.
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There are different in the mini lathes.?
I just purchased one November and look for weight and low cost.
Are looking for a price friendly or more easy of use and? hole size?
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On Thu, May 23, 2024 at 05:46 PM, Aaron Woods wrote:
It seems like the motor / speed control is a common issue with the 7" and 8" mini lathes, but I don't see many motor / speed control projects discussed.
I follow several different small lathe forums as I find info for one is often useful for another.
Motor swaps, are a common topic of discussion with other lathes from Unimats to 9x20.
Am I just not noticing this here, or is this just not a popular mod with these lathes for some reason.
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Get someone throwing away a treadmill. ?Pull the motor and control panel . ?They are very good dc motors
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Motorized exercise equipment is one of my favorite things to go curbmart shopping for on bulk trash pickup day! In addition to the electrical goodies, there's usually a fair amount of structural salvage, including the seat from an exercise bike as the start of a nice shop stool :-)
Roy
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He’ll probably chime in, but ISTR one guy here has replaced his with a Consew industrial sewing machine servo motor and controller. Similar to this?
--?
Bruce Johnson
The less a man knows about how sausages and laws are made, the easier it is to steal his vote and give him botulism.
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I have had the Consew 3/4 hp Brushless DC motor on my Craftsman 12 x 36 lathe, my Clausing 8520 Vertical?mill and my 16 " Delta Bandsaw.
I would think?the consew motor might be a bit much for a mini lathe but it would work. If you mounted the motor to the deck behind the lathe it would be a simple install.
Ralph
On Fri, May 24, 2024 at 7:52?PM Bruce J via <bruce.desertrat= [email protected]> wrote: He’ll probably chime in, but ISTR one guy here has replaced his with a Consew industrial sewing machine servo motor and controller. Similar to this?
--?
Bruce Johnson
The less a man knows about how sausages and laws are made, the easier it is to steal his vote and give him botulism.
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This is simply curiosity, I don't currently have a 7" lathe, but I'm sort of a small lathe junky so it is just a matter of time.?
The Consew and treadmill motors seem quite popular. I just haven't seen them discussed much in connection to the 7" lathes. Didn't know if there was a specific reason, or maybe I just haven't noticed.
With other lathes it is often to add variable speed which wouldn't be a plus in this case. I just thought with the control boards apparently being unreliable that swaps might still be popular.
The small compact size is another thought, a motor swap being a bit more involved than a small lathe with the motor mounted seperately.
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I think the reason we don’t hear a lot about using different motors is that places like LMS sell stock motors. ?If you need to replace your motor the easiest way is to buy an exact replacement which is easy to get.
A few people might want to replace a working motor with something “better” but most people realize this is not going to improve the quality of their finished parts. ?The Mini Lathe is just not massive enough for higher-powered motors. ? The motor is not the “weak link”.
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On May 25, 2024, at 10:38?AM, Aaron Woods via groups.io <awoods550@...> wrote:
This is simply curiosity, I don't currently have a 7" lathe, but I'm sort of a small lathe junky so it is just a matter of time.?
The Consew and treadmill motors seem quite popular. I just haven't seen them discussed much in connection to the 7" lathes. Didn't know if there was a specific reason, or maybe I just haven't noticed.
With other lathes it is often to add variable speed which wouldn't be a plus in this case. I just thought with the control boards apparently being unreliable that swaps might still be popular.
The small compact size is another thought, a motor swap being a bit more involved than a small lathe with the motor mounted seperately.
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I've never been interested in changing to a treadmill motor and controller because, from everything I've seen, when you slow a motor down electronically it lowers the rpm and lowers the torque. When you slow a motor with a back-gear, a jackshaft, or similar mechanical methods,? it lowers the rpm and RAISES the torque.??
This problem of losing torque when you slow down the RPM definitely exists with the minilathe motors. Does it also exist with these treadmill motors?
Mike Taglieri?
This is simply curiosity, I don't currently have a 7" lathe, but I'm sort of a small lathe junky so it is just a matter of time.?
The Consew and treadmill motors seem quite popular. I just haven't seen them discussed much in connection to the 7" lathes. Didn't know if there was a specific reason, or maybe I just haven't noticed.
With other lathes it is often to add variable speed which wouldn't be a plus in this case. I just thought with the control boards apparently being unreliable that swaps might still be popular.
The small compact size is another thought, a motor swap being a bit more involved than a small lathe with the motor mounted seperately.
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The tread mill motors are a good motor for a larger lathe . I
have one on my South Bend 9" lathe & love it . For one of
these 7" lathes I think a tread mill motor could be a bit much
& could cause damage to the lathe . All the TM motors I've
seen are 2 HP & up & that's a bit too much for these
lathes . The Consew may be a better choice? , I know they go down
to 1/2 HP on their motors .Maybe there's someone here that has
done one of these motor swaps & has some time on the machine
since can chime in .
YMMV
animal
On 5/25/24 10:38 AM, Aaron Woods wrote:
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This is simply curiosity, I don't currently have a 7" lathe, but
I'm sort of a small lathe junky so it is just a matter of time.?
The Consew and treadmill motors seem quite popular. I just haven't
seen them discussed much in connection to the 7" lathes. Didn't
know if there was a specific reason, or maybe I just haven't
noticed.
With other lathes it is often to add variable speed which wouldn't
be a plus in this case. I just thought with the control boards
apparently being unreliable that swaps might still be popular.
The small compact size is another thought, a motor swap being a
bit more involved than a small lathe with the motor mounted
seperately.
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On May 25, 2024, at 10:47?AM, Miket_NYC via groups.io <mctaglieri@...> wrote:
I've never been interested in changing to a treadmill motor and controller because, from everything I've seen, when you slow a motor down electronically it lowers the rpm and lowers the torque. When you slow a motor with a back-gear, a jackshaft, or similar mechanical methods,? it lowers the rpm and RAISES the torque.??
This depends entirely on how your controller works. ?Back in the old days, we controlled motor speed by controlling the voltage we send to the motor. ? ?There are still many controllers that work that way. ? ? So the motor generates less power at the lower voltage.
But today we have BLDC motors (no brushes) that are electrically commutated using MOSFETs in the controller. ?We can control the motor speed by controlling the rate of electrical switching and we can keep the current as high as we like even when turning slow or even with the motor stopped. ? ? ? Yes the BLDC motor can run at max current rating even when stationary. ?(think about stepper motors). ?A modern controller can control torque and speed INDEPENDENTLY.
An example is the electric car. ? The reason a Tesla model X SUV can do 0 to 60 MPH in 3 seconds is because electric motors (with modern controllers) have their greatest torque at ZERO RPM.
I’ll say that again, the motor has the most torque at zero RPM. ?The torque curve starts high and goes down as speed goes up. ? ?(assuming a well design controller)
Yes, you can still buy equipment with old-style motors and controllers. ? People buy them because they are cheaper than equipment with BLDC (brushless) motors.
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I agree?
Working with light lathe you different techniques over a larger lathe. On large I run the slower and take a massive cut.
The mini lathe I can run at higher speed and take light cuts. The down side if you are in production you need to replace or sharpen the tool bit more.
After all the mini lathe weight? is 60 to 200 pounds.?
A larger lathe is in tons.
Dave?
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On Sat, May 25, 2024 at 10:47 AM, Chris Albertson wrote:
I think the reason we don’t hear a lot about using different motors is that places like LMS sell stock motors. ?If you need to replace your motor the easiest way is to buy an exact replacement which is easy to get.
?
A few people might want to replace a working motor with something “better” but most people realize this is not going to improve the quality of their finished parts. ?The Mini Lathe is just not massive enough for higher-powered motors. ? The motor is not the “weak link”.
?
On May 25, 2024, at 10:38?AM, Aaron Woods via groups.io <awoods550@...> wrote:
This is simply curiosity, I don't currently have a 7" lathe, but I'm sort of a small lathe junky so it is just a matter of time.?
The Consew and treadmill motors seem quite popular. I just haven't seen them discussed much in connection to the 7" lathes. Didn't know if there was a specific reason, or maybe I just haven't noticed.
With other lathes it is often to add variable speed which wouldn't be a plus in this case. I just thought with the control boards apparently being unreliable that swaps might still be popular.
The small compact size is another thought, a motor swap being a bit more involved than a small lathe with the motor mounted seperately.
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The other part is a mini lathe has very little speed control?
Some have 2 speed and others have 4 speed . The rest of speed control is done with the motor control.??
I am using 1 hp and 1000 rpm just simple.?
The belt on 1000 rpm and 1 hp if turn control to 500 rpm ? hp. At 250 rpm ? hp. At 125 rpm ?hp. The motor stay at same torque?
Hope helps to see why the use a large motor?
Dave?
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I have a couple of the Consew motors, I have "thought" about putting?one on my mini lathe.
But I have so much to do that I probably will not get around to doing it.
The Consew gives full torque at slow speed.
Ralph
On Sat, May 25, 2024 at 3:04?PM davesmith1800 via <davesmith1= [email protected]> wrote: The other part is a mini lathe has very little speed control?
Some have 2 speed and others have 4 speed . The rest of speed control is done with the motor control.??
I am using 1 hp and 1000 rpm just simple.?
The belt on 1000 rpm and 1 hp if turn control to 500 rpm ? hp. At 250 rpm ? hp. At 125 rpm ?hp. The motor stay at same torque?
Hope helps to see why the use a large motor?
Dave?
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On Sun, May 26, 2024 at 07:52 AM, Ralph Hulslander wrote:
Consew motors,
sorry? but? wahat? is a ? Consew motors,
? motor?
a new? word? for me?
jack 47 71
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Jacques, . It is a Brushless sewing machine motor.
Ralph On Sun, May 26, 2024 at 11:15?AM Jacques Savard via <jacquessavard= [email protected]> wrote:
On Sun, May 26, 2024 at 07:52 AM, Ralph Hulslander wrote:
Consew motors,
sorry? but? wahat? is a ?Consew motors,
? motor?
a new? word? for me?
jack 47 71
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On Sun, May 26, 2024 at 8:15?AM Jacques Savard via <jacquessavard= [email protected]> wrote: On Sun, May 26, 2024 at 07:52 AM, Ralph Hulslander wrote:
Consew motors,
sorry? but? wahat? is a ?Consew motors,
? motor?
a new? word? for me?
jack 47 71
--
Buffalo John
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ok
I undestend? now
but? it is probaly? low power? about une qaurter? hp pr one? haft? at max
I also a astronomer?
and? we? control? oour? telescope? whit? stepping? moteor? from? washing machine
very powerfull? the? tork? is? at? is? max? all? time? whit? this? kind? of motor?
also? be? able? to? use? it? as? a? diverder??
you ca control? your late? at about? 22 step? per? turn? easyly? and? more? also
jack 47 71
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I have the older Consews on my CNC and grinder:
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On 5/26/2024 11:20 AM, BuffaloJohn via groups.io wrote:
On Sun, May 26, 2024 at 8:15?AM Jacques Savard via groups.io <jacquessavard=
[email protected]> wrote:
On Sun, May 26, 2024 at 07:52 AM, Ralph Hulslander wrote:
Consew motors,
sorry but wahat is a Consew motors,
motor
a new word for me
jack 47 71
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He some facts on most motors.?
A 2 speed cooler motor is two motors one is 1725 and the other is 1140 different horse power different torque?
Industry motors that two speed is one changing the poles from 4 to 8 pole.
Typically 1725 to 840 rpm same torque.
They have made motors outside this rule but are uncommon.
DC motors are typically the same torque for most of speed range.?
The low cost may not be same torque like vacuum cleaners?
Dave?
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davesmith1800
BuffaloJohn