Homemade grinding machine for precise work

[liberal]

In this viveo I show you how to make Homemade grinding machine for precise work. This sharpening machine will help you do precision work. I applied the motor from the washing machine. This high speed motor with speed regulation and stabilization.

Here are quality photos https://photos.app.goo.gl/8go6m16Zqi6h1QAA7

[Tuomas]

That's nice build mate!

[DIYer]

Thanks liberal! We've added your Grinding Machine to our Grinding category,
as well as to your builder page: liberal's Homemade Tools. Your receipt:

Grinding Machine by liberal

tags: grinder

[TrickieDickie]

That is a nice tool

[bobs409]

I could see that being very useful! I've already got a few good idea's in my head now... lol

[rlm98253]

Excellent design and fabrication, sir.

[Frank S]

Nice little arbor grinder much better than trying to use a chop saw

[Claudio HG]

Great, subscribed. Where did you get the regulator for the motor? I'm gonna make mine but if there is something ready I will go for buy instead of DIY.

[liberal]

I made it myself according to this scheme

[Claudio HG]

Nice, I love the simplicity of the circuit. It will start the motor from a shelf of around 60V and the feedback is not as precise as what would be achieved with an opamp but its simplicity is a plus, congratulations for your design.
I have a bunch of digitally controllable dimmers (10A 240V) so my idea was to control one of them with a couple of opamp and a comparator to pick up the feedback from the alternator (used as tachometer) usually found in washing machine motors or to pick up a simple encoder (just made with a hall sensor or a photocoupler and a cogwheel) for any universal motor that do not come with a pre-installed alternator/tachometer. This would be a very versatile circuit capable to provide good speed regulation. Since I can't find this kind of drivers on the market I thought it could be of interest for others because universal motors are ubiquitous and a cogwheel+hall sensor or a simple low resolution encoder disc are really easy to add and cheap.