On Sat, May 25, 2024 at 01:14 PM, Bruce J wrote:
Bruce Johnson
Bruce Johnson? I can? use? this kind? of magnet??
tey came? from? hard? disk positionner? very? easy? to? recycling? it also? about? you? problem of? changing? motor? the other post? I use a moteor? from a photocopier? ?whit? about 300 rpm? output?? and? I put a? stepping? motor? on? the input? shaft? like? this? the? stepping? are? vert? powefull?? and? i control? the? speed? esyly? at all? the? rage? also? my? next? step? are? to? use a pwerfull stepping? from? waching machine? tahat? the? dreem jack 47 71
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i've followed the thread about changing motors
why do we not see reeves drives with a standard ac motor
i think they're used on some wood lathes and larger mills
i used to work on them for driving positive displacement pumps
they're non-electronic and very simple
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Or free, often with convenient mounting holes included. Computer hard drives offer some really nice ones; older server-grade ones can have phenomenally strong ones. ?Be very careful to not let them ¡¯snap¡¯ together; they¡¯ll shatter into a million razor sharp shards.
A small selection of my collection (along with one of my late favorite pizza joint :-(?
Rare Earth magnets are now really inexpensive and you cn buy them on Amazon. ?These things are powerful enough to be dangerous if mishandled.
--? Bruce Johnson
"Wherever you go, there you are." B. Banzai, PhD
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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 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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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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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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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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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 am in the process of using an iGaging DRO on one of my Unimats. I am also experiencing some issues with mounting the system in a neat fashion.? "
Yes, these small lathes can be problematic in that regard.? I just learned about yet another approach, described in the January-February 2024 edition of The Home Shop Machinist.? I don't have the article itself, but it looks like the DRO extends off the back end of the cross slide.? This means that you need enough room behind your lathe to accommodate the scale.? The advantage is that it's pretty easy to include a cover to shield it from swarf.? I built my bench with scrap lumber and it is NOT deep enough to work with this approach.? As it is, it's pretty tight with the scheme I used.
Mark
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Yes, it should be clear that you can¡¯t mount the DRO at three locations and have them slide accurately unless you drill the mounting points with 0.0001 level precision. ? The ¡°roller¡± was to be EXACLY parallel in both directions the what is moving and that is impossibly hard to do. ? The solution is two-point mouting. ?Fix one end of the rule and the slider. ?Let the other end of the rule float.
It¡¯s not tension on the rule, it is that you can¡¯t expect to mount the rule parallel to the motion. ??
I think people try to hard to make the mounting strong. ?You can use 3D-printed plastic and magnets. ?Magnetic mounts if well-designed work well, Everyone use then on their dial indicators.
Rare Earth magnets are now really inexpensive and you cn buy them on Amazon. ?These things are powerful enough to be dangerous if mishandled.
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On May 25, 2024, at 8:00?AM, Ralph Hulslander via groups.io <rhulslander@...> wrote:
I have the iGaging dros on my Clausing 8520.
One thing I learned in installing them is that only one end needs to be fixed, the other end can float. I installed a long DRO with both ends fixed and had erroneous?errors. I Googling the problem I learned that I could let one end float relieving the tension that was causing the error.
Of course a "professional" installer freaks out when they hear this but they get paid to install them without the tension, fixed on both ends. I have one that has was installed ten years ago with a floating end and still working fine.
Ralph On Sat, May 25, 2024 at 9:37?AM OldToolmaker via <old_toolmaker= [email protected]> wrote: Mark,
I am in the process of using an iGaging DRO on one of my Unimats. I am also experiencing some issues with mounting the system in a neat fashion. ?
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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 Sat, May 25, 2024 at 11:00 AM, Ralph Hulslander wrote:
One thing I learned in installing them is that only one end needs to be fixed, the other end can float.
I took that approach on all but my latest install, the one that's the subject of this thread (for a grand total of 5 DROs, three on the mill and two on the lathe).? I wasn't sure how it was going to work out but it appears to be OK.? The main problem I have encountered with iGaging DROs is their EMI susceptibility.? I have added additional bypass capacitors to all of mine.? That's all it took for the ones on the lathe, maybe because the stainless steel scales don't develop contact problems.? The DROs on my mill have the aluminum scales and they were a PITA when it came to EMI problems.? The only thing that reliably worked was to hard-wire the scales to the sensor's internal ground node.
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I have the iGaging dros on my Clausing 8520.
One thing I learned in installing them is that only one end needs to be fixed, the other end can float. I installed a long DRO with both ends fixed and had erroneous?errors. I Googling the problem I learned that I could let one end float relieving the tension that was causing the error.
Of course a "professional" installer freaks out when they hear this but they get paid to install them without the tension, fixed on both ends. I have one that has was installed ten years ago with a floating end and still working fine.
Ralph
On Sat, May 25, 2024 at 9:37?AM OldToolmaker via <old_toolmaker= [email protected]> wrote: Mark,
I am in the process of using an iGaging DRO on one of my Unimats. I am also experiencing some issues with mounting the system in a neat fashion. ?
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Mark,
I am in the process of using an iGaging DRO on one of my Unimats. I am also experiencing some issues with mounting the system in a neat fashion. ?
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I am seeing many old posts appearing when I open Unimat site.
Any ideas as to what is going on? Or am I missing something? I am seeing old posts as far back as 2010.
Dick
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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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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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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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Get someone throwing away a treadmill. ?Pull the motor and control panel . ?They are very good dc motors
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davesmith1800
OldToolmaker