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Look at improve the longevity of the mini lathe motor.
I see a lot members having motors problems. Now is from environmental , operator , motor control board or motor errors?
FYI There are two basic type use on mini lathes DC motor and brushless aka {electronic 3 phase} motor.
This only on the DC type.
Please post how fix or you replace motor.
Dave
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On my HF mini lathe the controller failed but I had been saving a treadmill motor (110 DC permanent magnet motor with a large flywheel and small diameter poly groove belt pulley) to provide more overall torque. This motor did require a mounting bracket as it is to large for the under bed location. I also drilled a small hole parallel to the motor shaft half into the pulley and half into the shaft and drove a pin in to prevent the flywheel coming off when the motor started. It was only secured with a bolt thread in the treadmill. I have a shop made poly groove pulley on the spindle instead of the OEM toothed belt input pulley. The DCPM motor maintains high torque with low RPM when it receives less DC voltage. It's range is 0-110 VDC and this is provided by an inexpensive SCR based AC lamp dimmer circuit and a full wave bridge rectifier (Amazon) and a DPDT (6 terminal) switch provides reverse. This setup does not use the change gears and does not drive the lead screw so I feed the cross slide manually. I do plan to redesign it soon to include a jack shaft with a toothed belt to drive the OEM input pulley and therefore the change gears, the lead screw, and the hi/lo range gears and this should allow much slower RPM with high torque. Since I acquired the motor for free and built the hardware to mount it my only cost was for the SCR dimmer, the rectifier, and the DPDT switch.
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JTPIKITECH
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Interesting replacement.
I do not here of any one changing brushes.
I do know the type and size of brushes the use on mini lathe motor will last 1,000 to 3,000 hours. Items like sewing machines and treadmill mills usecsamevtype motor.
A squire cage motor has life of over 20,000 because of the ball bearing. Most found on older mini lathes.
The industrial DC motor brush life between changse is 7,000 to 10,000 hours. Probably to costly for mini lathes
FYI on oil run motors like the homes AC will last about 20 years and has a Chinese made oil capacitor needs to change every 5 to 7 years American will last 12 to 20 years. This is available and can be same category as a AC motor. Do have number of hours just years
So I look at the problems member are having and wonder why and can be fix and low cost.
Dave
FYI
On electronics control boards
Most time it is a manufacturer error, over heating, voltage stickers or drit on the board.
My example is clock my wife and self purchase 32 years ago and use everyday is still running or 280,000 hours and still going
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Show quoted text
On Sun, Jul 14, 2024 at 06:25 AM, <jtpikitech8@...> wrote:
On my HF mini lathe the controller failed but I had been saving a treadmill motor (110 DC permanent magnet motor with a large flywheel and small diameter poly groove belt pulley) to provide more overall torque. This motor did require a mounting bracket as it is to large for the under bed location. I also drilled a small hole parallel to the motor shaft half into the pulley and half into the shaft and drove a pin in to prevent the flywheel coming off when the motor started. It was only secured with a bolt thread in the treadmill. I have a shop made poly groove pulley on the spindle instead of the OEM toothed belt input pulley. The DCPM motor maintains high torque with low RPM when it receives less DC voltage. It's range is 0-110 VDC and this is provided by an inexpensive SCR based AC lamp dimmer circuit and a full wave bridge rectifier (Amazon) and a DPDT (6 terminal) switch provides reverse. This setup does not use the change gears and does not drive the lead screw so I feed the cross slide manually. I do plan to redesign it soon to include a jack shaft with a toothed belt to drive the OEM input pulley and therefore the change gears, the lead screw, and the hi/lo range gears and this should allow much slower RPM with high torque. Since I acquired the motor for free and built the hardware to mount it my only cost was for the SCR dimmer, the rectifier, and the DPDT switch.
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JTPIKITECH
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I was looking internet on longevity of dc motors and founds you may like read.
The first is the most common motors for mini lathes.
The second link is on industrial DC motor they very expensive for mini lathes.
If read it said same busily thing I did on my last post
Mini lathe burshes latest 1,000 to 3,000 and industrial motor 7,5000 hours.
But some may like reading.
.
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QuestionWhen running at low speed do you
- change your belts
- Keep belt the the same and just adjust motor speed
- Something else
Second Question How slow do you typically turn in low speed work?
- Under 100 RPM
- 300 RPM
- 500 RPM
- Over 600 RPM
Dave
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I got my Speedway mini lathe in June of 2002 and have used it extensively with no motor problems. I did have to have the control box repaired about three?years ago. John
On Sun, Jul 14, 2024 at 9:37?AM davesmith1800 via <davesmith1= [email protected]> wrote: I was looking internet on longevity of dc motors and founds you may like read.
The first is the most common motors for mini lathes.
The second link is on industrial DC motor they very expensive for mini lathes.
If read it said same busily thing I did on my last post
Mini lathe burshes latest 1,000 to 3,000 and industrial motor 7,5000 hours.
But some may like reading.
.
|
That is great news.
I have been reading a lot motors troubles on mini lathe.
I could be speed the min lathe runs at is the different.
Do you due most work on higher motor speed?
Dave
toggle quoted message
Show quoted text
On Sun, Jul 14, 2024 at 11:36 AM, John Mattis wrote:
I got my Speedway mini lathe in June of 2002 and have used it extensively with no motor problems.
I did have to have the control box repaired about three?years ago.
John
On Sun, Jul 14, 2024 at 9:37?AM davesmith1800 via <davesmith1= [email protected]> wrote: I was looking internet on longevity of dc motors and founds you may like read.
The first is the most common motors for mini lathes.
The second link is on industrial DC motor they very expensive for mini lathes.
If read it said same busily thing I did on my last post
Mini lathe burshes latest 1,000 to 3,000 and industrial motor 7,5000 hours.
But some may like reading.
.
?
?
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The speed depends on the material and the diameter.? I have turned a piece of 3 inch diameter stainless down to make a ER 32 collet chuck.? I don’t take budget cuts.? On a recent part I took 0.040 from the diameter on a piece of 1 inch diameter steel.? John?
On Sun, Jul 14, 2024 at 2:05?PM davesmith1800 via <davesmith1= [email protected]> wrote: That is great news.
I have been reading a lot motors troubles on mini lathe.
I could be speed the min lathe runs at is the different.
Do you due most work on higher motor speed?
Dave
On Sun, Jul 14, 2024 at 11:36 AM, John Mattis wrote:
I got my Speedway mini lathe in June of 2002 and have used it extensively with no motor problems.
I did have to have the control box repaired about three?years ago.
John
On Sun, Jul 14, 2024 at 9:37?AM davesmith1800 via <davesmith1= [email protected]> wrote: I was looking internet on longevity of dc motors and founds you may like read.
The first is the most common motors for mini lathes.
The second link is on industrial DC motor they very expensive for mini lathes.
If read it said same busily thing I did on my last post
Mini lathe burshes latest 1,000 to 3,000 and industrial motor 7,5000 hours.
But some may like reading.
.
?
?
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When using my lathe I switched the belt to low speed this make the motor run faster . My temperature gauge tells that never gets very hot.
WhatI I am thinking if use lathe motor at higher speed cuts will increase the life of motor.
I just read where someone had motor problems and found carbon dust inside.
{If look a Bridport mill power feed. The motor brushes are at bottom if ever took part you find carbon dust on cover plate. Motors used swing machines the dust blown out.}
Now when look mini lathe motor running very low speed the fan is not blowing enough to clear this dust out. So collects in bad places and takes out the motor.
It is only guess at point but looks what problem The solution is change the belt speed.
Dave
toggle quoted message
Show quoted text
On Sun, Jul 14, 2024 at 02:12 PM, John Mattis wrote:
The speed depends on the material and the diameter.?
I have turned a piece of 3 inch diameter stainless down to make a ER 32 collet chuck.?
I don’t take budget cuts.?
On a recent part I took 0.040 from the diameter on a piece of 1 inch diameter steel.?
John?
On Sun, Jul 14, 2024 at 2:05?PM davesmith1800 via <davesmith1= [email protected]> wrote: That is great news.
I have been reading a lot motors troubles on mini lathe.
I could be speed the min lathe runs at is the different.
Do you due most work on higher motor speed?
Dave
On Sun, Jul 14, 2024 at 11:36 AM, John Mattis wrote:
I got my Speedway mini lathe in June of 2002 and have used it extensively with no motor problems.
I did have to have the control box repaired about three?years ago.
John
On Sun, Jul 14, 2024 at 9:37?AM davesmith1800 via <davesmith1= [email protected]> wrote: I was looking internet on longevity of dc motors and founds you may like read.
The first is the most common motors for mini lathes.
The second link is on industrial DC motor they very expensive for mini lathes.
If read it said same busily thing I did on my last post
Mini lathe burshes latest 1,000 to 3,000 and industrial motor 7,5000 hours.
But some may like reading.
.
?
?
?
?
|
What is there to figure out?? Better components simply cost more to manufacture than poor quality components and quality control adds costs that are not passed on to consumers from companies with little quality control.? ? Jerry F. ?????????????????????????????????????????? ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of davesmith1800
Sent: Sunday, July 14, 2024 7:59 AM
To: [email protected]
Subject: Re: [7x12MiniLathe] Mini lathe DC motor longevity? Interesting replacement.
I do not here of any one changing brushes.
I do know the type and size of brushes the use on mini lathe motor will last 1,000 to 3,000 hours. Items like sewing machines and treadmill mills usecsamevtype motor.
A squire cage motor has life of over 20,000 because of the ball bearing. Most found on older mini lathes
The industrial DC motor brush life between changse is 7,000 to 10,000 hours. Probably to costly for mini lathes
FYI on oil run motors like the homes AC will last about 20 years and has a Chinese made oil capacitor needs to change every 5 to 7 years American will last 12 to 20 years. This is available and can be same category as a AC motor. Do have number of hours just years
So I look at the problems member are having and wonder why and can be fix and low cost.
Dave
FYI
On electronics control boards
Most time it is a manufacturer error, over heating, voltage stickers or drit on the board.
My example is clock my wife and self purchase 32 years ago and use everyday is still running or 280,000 hours and still going
On Sun, Jul 14, 2024 at 06:25 AM, <jtpikitech8@...> wrote: On my HF mini lathe the controller failed but I had been saving a treadmill motor (110 DC permanent magnet motor with a large flywheel and small diameter poly groove belt pulley) to provide more overall torque. This motor did require a mounting bracket as it is to large for the under bed location. I also drilled a small hole parallel to the motor shaft half into the pulley and half into the shaft and drove a pin in to prevent the flywheel coming off when the motor started. It was only secured with a bolt thread in the treadmill. I have a shop made poly groove pulley on the spindle instead of the OEM toothed belt input pulley. The DCPM motor maintains high torque with low RPM when it receives less DC voltage. It's range is 0-110 VDC and this is provided by an inexpensive SCR based AC lamp dimmer circuit and a full wave bridge rectifier (Amazon) and a DPDT (6 terminal) switch provides reverse. This setup does not use the change gears and does not drive the lead screw so I feed the cross slide manually. I do plan to redesign it soon to include a jack shaft with a toothed belt to drive the OEM input pulley and therefore the change gears, the lead screw, and the hi/lo range gears and this should allow much slower RPM with high torque. Since I acquired the motor for free and built the hardware to mount it my only cost was for the SCR dimmer, the rectifier, and the DPDT switch.
--
JTPIKITECH
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I agree
They do a lot of short cuts to cheap the price
This a motor I have purchased 40 years age for machine tools great longe lasting motor.
The draw back is cost more than lathe Then the control board is haft the cost of motor.
This type motor has life of over 20,000 hours before rebuilding aka replace ball bearing , turn comutator and spaying enamel on copper winding.
So do mind the low cost motor from China in retirement.
They should last longer and can rebuilt too.
This better motor I was writing about
Dave
toggle quoted message
Show quoted text
On Sun, Jul 14, 2024 at 03:59 PM, Gerald Feldman wrote:
What is there to figure out?? Better components simply cost more to manufacture than poor quality components and quality control adds costs that are not passed on to consumers from companies with little quality control.?
?
Jerry F. ??????????????????????????????????????????
?
?
?
Interesting replacement.
I do not here of any one changing brushes.
I do know the type and size of brushes the use on mini lathe motor will last 1,000 to 3,000 hours. Items like sewing machines and treadmill mills usecsamevtype motor.
A squire cage motor has life of over 20,000 because of the ball bearing. Most found on older mini lathes
The industrial DC motor brush life between changse is 7,000 to 10,000 hours. Probably to costly for mini lathes
FYI on oil run motors like the homes AC will last about 20 years and has a Chinese made oil capacitor needs to change every 5 to 7 years American will last 12 to 20 years. This is available and can be same category as a AC motor. Do have number of hours just years
So I look at the problems member are having and wonder why and can be fix and low cost.
Dave
FYI
On electronics control boards
Most time it is a manufacturer error, over heating, voltage stickers or drit on the board.
My example is clock my wife and self purchase 32 years ago and use everyday is still running or 280,000 hours and still going
On Sun, Jul 14, 2024 at 06:25 AM, <jtpikitech8@...> wrote:
On my HF mini lathe the controller failed but I had been saving a treadmill motor (110 DC permanent magnet motor with a large flywheel and small diameter poly groove belt pulley) to provide more overall torque. This motor did require a mounting bracket as it is to large for the under bed location. I also drilled a small hole parallel to the motor shaft half into the pulley and half into the shaft and drove a pin in to prevent the flywheel coming off when the motor started. It was only secured with a bolt thread in the treadmill. I have a shop made poly groove pulley on the spindle instead of the OEM toothed belt input pulley. The DCPM motor maintains high torque with low RPM when it receives less DC voltage. It's range is 0-110 VDC and this is provided by an inexpensive SCR based AC lamp dimmer circuit and a full wave bridge rectifier (Amazon) and a DPDT (6 terminal) switch provides reverse. This setup does not use the change gears and does not drive the lead screw so I feed the cross slide manually. I do plan to redesign it soon to include a jack shaft with a toothed belt to drive the OEM input pulley and therefore the change gears, the lead screw, and the hi/lo range gears and this should allow much slower RPM with high torque. Since I acquired the motor for free and built the hardware to mount it my only cost was for the SCR dimmer, the rectifier, and the DPDT switch.
--
JTPIKITECH
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Thank you all for your input
What found is the carbon dust from burshes is staying inside.
This like carbon resistor. The across electrical heater up the motor.
To fix the it could be as simple running motor on high speed at end of day.
It could oil mist making carbon stick and cleaning the every year or two.
I will post my views on the biggest reason all types of control board failures. On new thread and look forward to your views.
This is a problem with mini lathes and lot if other tool and things.
Dave
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There are a number of things that can be done to seal the lead screw opening in the control box. That was a big topic years ago! The easiest one is to slide a garden hose washer on to the lead screw, a better version uses a thin, larger diameter, plastic washer between 2 garden hose washers. A more elaborate seal uses a short length of PVC pipe bored to a close fit over the lead screw & glued to a piece of sheet plastic that's screwed onto the control box housing.
?
Roy
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Don't know what the leadscrew has to do with motor longevity, but if concerned with debris getting into the control box (a possibility) and shorting electronic components:
?
LMS Part number 2562? ---? Lead Screw Chip Guard? ---? $2.89
?
https://littlemachineshop.com/products/product_view.php?ProductID=2562
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Lone Tree, Colorado? ?USA
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I agree?
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I plan to start thread on control board/box later.? It more fof information but is very important to almost everything around us. It is thread that can not be contained just to mini lathe. But because a of lot of things uses control boards like DRO'S , AC and even welders.?
?
Dave?
?
On Tue, Jul 16, 2024 at 05:36 AM, Craig Hopewell wrote:
Don't know what the leadscrew has to do with motor longevity, but if concerned with debris getting into the control box (a possibility) and shorting electronic components:
?
LMS Part number 2562? ---? Lead Screw Chip Guard? ---? $2.89
?
https://littlemachineshop.com/products/product_view.php?ProductID=2562
--
Lone Tree, Colorado? ?USA
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davesmith1800
John Mattis