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DC Motor
Posted by: John DeMartini (---)
Date: November 03, 2020 06:37PM

Looking for dc motor from starting voltage to 12 volts that will go 1200 to 1500 RPM max. Is there such a motor or close to it?

I am making a dedicated turning center for finishing cork grips so a heavy duty motor is not needed but not out of the running.

My plan is to go direct drive and eliminate any speed reduction hardware.

Presently I adapt my wrapper to my mini metal lathe and do my work but it is a nuisance to set up each time.

Any suggestions will be appreciated.

Thanks

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Re: DC Motor
Posted by: John DeMartini (---)
Date: November 03, 2020 07:04PM

Thanks for the quick reply
I think I unhid my email address.

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Re: DC Motor
Posted by: roger wilson (---)
Date: November 04, 2020 01:30PM

John,
Just to be clear - are you going to be doing cork shaping and sanding with this motor?

If so, you do need a motor that has some moxy to turn and shape the cork.

I really good source for this type motor is a cordless drill motor with its gear train. You can often pick up such a rig at a 2nd hand store or pawn shop for a few dollars.

Here is a picture of such a unit that I built many years ago, using a $2 cordless drill motor from a surplus cordless drill.

[www.rodbuilding.org]

I power it with a 10 amp variable voltage DC power supply

The one down side of such a setup is the noise from the gears. Essentially the same sound of gears that one gets when one uses a standard or cordless drill.

------------------------------------

Here is another picture of a different setup.
In this case, the motor is a 120 volt DC direct drive motor with a top speed of 2500 rpm.
The motor is powered with an AC variac - followed by a full bridge rectifier to convert the AC voltage to DC voltage.
In this case, there are no gears, just a nice strong motor that works exceptionally well for using as a variable speed turning motor:

[www.rodbuilding.org]

This is a picture of the motor - along with the AC variac and dc rectifier enclosed in a junction box.

[www.rodbuilding.org]

In this particular case, the motor is mounted with an XL cogged pulley on the output shaft. The power is coupled to a Taig head stock and chuck using an XL cogged belt driving an XL pulley on the head stock.

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Re: DC Motor
Posted by: John DeMartini (---)
Date: November 04, 2020 02:20PM

Roger

I will not be turning or shaping grips with this set up, The only thing I will be doing is light sanding and cleaning grips of finished rods as part of a repair service and for maintenance of my personal rods.

Your cordless drill set up would be perfect all I need to do is to adapt the assembly to my wrapper base. Easy on easy off and will eliminate the effort of adapting my wrapper to the lathe.

Regards
John

.

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Re: DC Motor
Posted by: roger wilson (---)
Date: November 04, 2020 06:09PM

John,

Another thought:

You could use an ultra simple setup like this one if you wish"

[www.rodbuilding.org]

Essentially, it is a flex coat chuck attached to the shaft of a lower speed gear motor. The dc gear motor is being driven by a variable speed controller.

-----------------------------
If you wanted to use a cordless drill motor and gear train, you could pick up a 10 amp power supply like this one:

[www.amazon.com]

Then, connect it to a variable speed motor controller, similar to this one:

[www.amazon.com]

Just plug your power supply into a switched extension cord and you will be set.

-------------------------------

If you happen to have a cordless drill laying around with no batteries, just strip it down for the motor and attached gear train. Make a base to support the motor and hook it up to the output of the speed controller that is hooked to the dc power supply and you will be set.

------------------------------
For myself, when using my setup, I use a "shank" obtained from Shamrock industries that has a 1/2 inch solid shaft at one end that fits the drill and a 3/4 X 16 threaded insert on the other end. Then, I use a 3 inch Taig chuck that is simply screwed onto the "shank" that is being held with the drill chuck on the cordless drill motor and gear train. Plug in the rod in question, turn on the power supply and go to work.

Best wishes.

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Re: DC Motor
Posted by: John DeMartini (---.inf6.spectrum.com)
Date: November 04, 2020 08:49PM

Thanks Roger excellent suggestions and leads I an going in that direction.
Regards
John.

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