Home made bench grinder / drill

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Steven
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Joined: 19 Aug 2002, 18:32
Location: Belgium
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Home made bench grinder / drill

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Hi,

I'm trying to build myself a circular grinder (or fixed drill) for a bench, but I'm left wondering which motor to use for that. I've seen some DIY videos here and there, with some people using motors really big motors, but I think something like in a hand drill would do.

Essentially, I want a motor that I can "easily" fix on a board, with adjustable speed (0 - 200rpm would actually be enough)

Any ideas where I could find such a "simple" motor and speed control?

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Big Tea
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Joined: 24 Dec 2017, 20:57

Re: Home made bench grinder / drill

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Steven wrote:
21 Sep 2020, 21:21
Hi,

I'm trying to build myself a circular grinder (or fixed drill) for a bench, but I'm left wondering which motor to use for that. I've seen some DIY videos here and there, with some people using motors really big motors, but I think something like in a hand drill would do.

Essentially, I want a motor that I can "easily" mounted on a board, with adjustable speed (0 - 200rpm would actually be enough)

Any ideas where I could find such a "simple" motor and speed control?
A drill. You get the chuck then too. you can replace the trigger with a Potentiometer if you use a cordless too.

For a quick job, I use a 'handle' that used to clamp on behind the chuck bolted to a 'G' clamp.

( https://uk.banggood.com/search/dc-motor ... l?from=nav )
Last edited by Big Tea on 22 Sep 2020, 10:24, edited 1 time in total.
When arguing with a fool, be sure the other person is not doing the same thing.

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Steven
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Joined: 19 Aug 2002, 18:32
Location: Belgium
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Re: Home made bench grinder / drill

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Your link doesn't work...

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Big Tea
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Joined: 24 Dec 2017, 20:57

Re: Home made bench grinder / drill

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Steven wrote:
22 Sep 2020, 08:25
Your link doesn't work...
Sorry, tried several times to correct it but having no luck .

search at banggood.com for dc-motor speed control. Any of these, the cheapest is fine.


I use the original 'trigger' on one with a cable tie around it.

( https://uk.banggood.com/Universal-Mini- ... rehouse=CN ) if you are able to clamp the drill, some do not have a suitable place.


Do you need it large? Mostly I use a dremel style tool that comes in a kit for around £20 (cheap ones not real Dremel) . There are so many good projects on youtube to do just about anything with them
When arguing with a fool, be sure the other person is not doing the same thing.

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nzjrs
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Joined: 07 Jan 2015, 11:21
Location: Redacted

Re: Home made bench grinder / drill

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Big Tea wrote:
22 Sep 2020, 10:35
Steven wrote:
22 Sep 2020, 08:25
Your link doesn't work...
Sorry, tried several times to correct it but having no luck .

search at banggood.com for dc-motor speed control. Any of these, the cheapest is fine.


I use the original 'trigger' on one with a cable tie around it.

( https://uk.banggood.com/Universal-Mini- ... rehouse=CN ) if you are able to clamp the drill, some do not have a suitable place.


Do you need it large? Mostly I use a dremel style tool that comes in a kit for around £20 (cheap ones not real Dremel) . There are so many good projects on youtube to do just about anything with them
I've done a few home made CNC type things and I would agree with Big Tea about the drill in principle.

I think things like dremel and routers (used for home made CNC, e.g. DWP611) have very poor low RPM torque, which would rule them out for use as a grinder I guess.

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Big Tea
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Joined: 24 Dec 2017, 20:57

Re: Home made bench grinder / drill

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nzjrs wrote:
22 Sep 2020, 10:45
Big Tea wrote:
22 Sep 2020, 10:35
Steven wrote:
22 Sep 2020, 08:25
Your link doesn't work...
Sorry, tried several times to correct it but having no luck .

search at banggood.com for dc-motor speed control. Any of these, the cheapest is fine.


I use the original 'trigger' on one with a cable tie around it.

( https://uk.banggood.com/Universal-Mini- ... rehouse=CN ) if you are able to clamp the drill, some do not have a suitable place.


Do you need it large? Mostly I use a dremel style tool that comes in a kit for around £20 (cheap ones not real Dremel) . There are so many good projects on youtube to do just about anything with them
I've done a few home made CNC type things and I would agree with Big Tea about the drill in principle.

I think things like dremel and routers (used for home made CNC, e.g. DWP611) have very poor low RPM torque, which would rule them out for use as a grinder I guess.

The 775 motor in most drills is poor for torque too but usually work through a planetary gearbox to multiply it.
A small dia. grinder in a dremel tool is usually quite good, but as you say, as it goes to larger dia. disks it stalls.
When arguing with a fool, be sure the other person is not doing the same thing.

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Steven
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Joined: 19 Aug 2002, 18:32
Location: Belgium
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Re: Home made bench grinder / drill

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I think I'm going going to get some cheap motor and a pwm voltage regulator, and see how far that gets me.
Maybe I'll learn a thing or two from this, and then know if it's sufficient, or what I really need to look for.

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dans79
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Joined: 03 Mar 2013, 19:33
Location: USA

Re: Home made bench grinder / drill

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Steven wrote:
21 Sep 2020, 21:21
Hi,

I'm trying to build myself a circular grinder (or fixed drill) for a bench, but I'm left wondering which motor to use for that. I've seen some DIY videos here and there, with some people using motors really big motors, but I think something like in a hand drill would do.

Essentially, I want a motor that I can "easily" fix on a board, with adjustable speed (0 - 200rpm would actually be enough)

Any ideas where I could find such a "simple" motor and speed control?
What exactly are you trying to build, I'm not really seeing it. Sounds almost like you want to make a slow speed carbide lap.


Without knowing more, the first thing that comes to mind is a small stepper motor (nema 17 or 23), and then you could just control it with a raspberry pi or arduino.
197 104 103 7

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Big Tea
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Joined: 24 Dec 2017, 20:57

Re: Home made bench grinder / drill

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There is a very basic one here. you can modify it in many ways

( )
When arguing with a fool, be sure the other person is not doing the same thing.


kalinka
9
Joined: 19 Feb 2010, 00:01
Location: Hungary

Re: Home made bench grinder / drill

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a washing-machine universal motor would be OK for you. It has a great low RPM torque, and can be controlled with simple controllers. The downside is, it is quite big and heavy.

https://www.youtube.com/watch?v=2qFUQw2IHwg

kalinka
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Joined: 19 Feb 2010, 00:01
Location: Hungary

Re: Home made bench grinder / drill

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kalinka wrote:
05 Oct 2020, 08:05
a washing-machine universal motor would be OK for you. It has a great low RPM torque, and can be controlled with simple controllers. The downside is, it is quite big and heavy.

https://www.youtube.com/watch?v=2qFUQw2IHwg
EDIT: Also, it has a tach out which helps with precise RPM control, and the RPM can be measured easily with a simple microcontroller, or a dedicated circuit.

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