Fuch Polishing Using DC Motor: Help Needed

[JackMan]

Thanks for the advice guys. Safe in Sweden, it's your thread that I was looking for... what more can you tell me about your set up?

I note that you just let the wheel sit on the wooden hub and spin it that way. More tips?

wj

[JackMan]

What would you guys think of this?

Imagine if I bought a variable speed 8 inch bench grinder from Sears.

I could remove the dust/shrapnel safety cover, remove the grinder wheel, and mount a wooden hub on the now vertical shaft of the "grinder", then mount the grinder on a piece of board, then put the board in my vice.

Any idea what HP size motor I should get? If 2HP will rip my arm off and beat me with the bloody stump, will a 1HP motor be enough? I worry about the torque needed to move the weight of a wheel.

Wellborn

Then, after the project

[ZOA NOM]

Originally Posted by stevemfr

I dig the flops, Zoanas

Those are "safety" flops, dude.

Originally Posted by PBH

I don't bother reading his posts. They're secondary.

I'm not sure whether to be insulted or not...

[rick-l]

Did you try a car battery with your treadmill motor? 12 volts should run it about 480 rpm no load with .8 ft-lbs of torque stalled.

[safe]

Originally Posted by JackMan

Thanks for the advice guys. Safe in Sweden, it's your thread that I was looking for... what more can you tell me about your set up?

I note that you just let the wheel sit on the wooden hub and spin it that way. More tips?

wj

The motor I got (used at a scrap yard) had a M8 hole in the axle, not sure if all motors have something like that.
I cut out the "hub" a little to big and bolted it down. Then I started it up and turned down the hub to a perfect fit, like on a wood lathe.

What ever you do, protect your lungs, my entire garage was covered in a very fine aluminum dust.

[JackMan]

Thanks for the follow up Mr. Safe,
Rick, great idea on the battery.
Zonas, I hope you are getting a patent on those safety flip flops.

Thanks to all, couldn't do it without Pelican People.

Thinking of changing my signature to PCar People Tinker Cause It's Fun.

[JackMan]

Here's the current status of the project:

I am going forward with the 2HP DC Motor. KB Electronics makes an "adapter" that I plug the DC motor into, then plug the adapter into the 120V outlet. This adapter has a variable speed control. I called KB Electronics, quized the tech rep, then found what I needed locally for about $130 shipped to my office. (I figure I'm 45 years old and I'll redue a set of Fuchs at least three more times in my lifetime. So, this makes for a good investment. Just practicing rationalizing the expense to my wife.)

I dropped off the DC motor and a Fuch with a friend/client of mine that is an aircraft machinist. (Never hurts to have one of these guys as a friend. It amazes me the things he and his bunch can do.) I went to his shop at lunch today and I was the center of attention. Five machinist gathered around and started giving ideas. Over lunch tomorrow they are going to machine me a hub for the motor that I can screw onto the motor axle and the slip the Fuch onto the hub. It'll all be held in place with some "pins."

I'm going to take a 2x8 and bolt it vertically to my bench. Then I'll bolt the DC motor to the 2x8.

Thanks for everyone's help and ideas. I'll take pictures once I have it all put together.

Wellborn

Love Live the Memory of Warren. He helped those he never met and will continue to inspire those who are lucky enough to share in the ownership of a Porsche.

[JackMan]

Below is a description of the adapter I purchased from www.kbelectronics.com

I include this for historical reference of the BBS.

The Model KBMD-240D, also called Multi-Drive™, is a packaged SCR drive in a NEMA-1 enclosure. It utilizes the KBMM™ speed control for its electronics. The Multi-Drive™ is rugged and compact in size. It handles both 115 and 230VAC line inputs by setting the built-in Dual Voltage Switch. In addition, the single model can be used on a wide range of motor horsepower by inserting the appropriate Plug-in Horsepower Resistor®. The Auxiliary Heatsink (optional) increases the rating of the basic unit. An optional Forward-Brake-Reverse Switch Kit is also available.

[SCWDP911]

sub'd

[theclaw]

Is this what you are looking for? This motor was salvaged from a washing machine.

New way to refinish wheels

This is what I did:

[theclaw]

I should add that I have a couple of spare motors I'm willing to let go.

[JackMan]

Jeff,

This is what I want to do in concept. I just don't want to do it with the wheel attached to the car. First, it's 20 degrees in my garage. Second, I don't think its safe. Third, I don't want all that aluminum grit in the air to fall on my car's paint, near engine, near axle, etc.

Rick,

Yes. The battery worked perfectly. I used a 12V car battery to test the motor to make sure it worked. I'm looking for eternal power, batteries run out. And, I'm looking for a bit more RPM. In a pinch, for a short run of wheels it would make sense. I'm just looking for a permanent solution and this is a fun project along the lines of a rube goldberg type of thing.

wj

[JackMan]

Jeff,

BTW, nice cradle you built for the motor. Do you have a picture of the end of the motor's axle and what you used to "power the wheel"?

wj

[Porsche_monkey]

Doesn't anyone have access to a lathe?

[cgarr]

Originally Posted by PBH

Doesn't anyone have access to a lathe?

Yea, an old brake lathe for turning drums works nice..

[theclaw]

Originally Posted by JackMan

Jeff,

This is what I want to do in concept. I just don't want to do it with the wheel attached to the car. First, it's 20 degrees in my garage. Second, I don't think its safe. Third, I don't want all that aluminum grit in the air to fall on my car's paint, near engine, near axle, etc.

Rick,

Yes. The battery worked perfectly. I used a 12V car battery to test the motor to make sure it worked. I'm looking for eternal power, batteries run out. And, I'm looking for a bit more RPM. In a pinch, for a short run of wheels it would make sense. I'm just looking for a permanent solution and this is a fun project along the lines of a rube goldberg type of thing.

wj

Its actually pretty safe. I used the front axle to spin the wheel. By the time I did this I had used Oven cleaner to get off the hard stuff and this was a way to make sure I had a uniform finish on the rim as I planned to paint the spokes. There is very little waste flying off the wheel in this process. Not like a buffing wheel. I know!

The temp in the garage doesn't really effect the process. I used to work out of a detached garage with one of those turbo kerosene heaters. My wife complained that I always smelled like fumes when I got in the house but it was worth hiding out for a while.

[theclaw]

Originally Posted by JackMan

Jeff,

BTW, nice cradle you built for the motor. Do you have a picture of the end of the motor's axle and what you used to "power the wheel"?

wj

Thanks, I used a discarded bicycle tire to grip the rim and zip ties to hold it on. If you go to my original thread there are a bunch of pictures.

[JackMan]

Update:

The original DC motor I had planned to use will not work with the KB Electronics device I was advised to purchase by the tech department at KB Electronics.

I went to the distributor, Ohio Brake and Clutch in Sharon Center, OH, to exchange the KB device for another device. (I quickly identified myself as an amateur at electrical stuff and these people couldn't have been nicer and more helpful.) The new device was going to cost a fortune, more than $300, given the application. The owner said it would be easier to just "give" me a new DC motor. And that's what he did, right off the shelf. Yeah, it was used, but its better, cooler, bigger, lots more torque than my treadmill motor .... pics later.

I'm tired and have to hit the road for five days of travel. When I get back I'll pick up on the project and update everyone. Meanwhile I have clean three wheels and even started some sanding and polishing.

wj