Ski Grinder restoration (Complete!)

rockaukum · Post by **rockaukum** » Sat Jul 24, 2010 11:25 am

Twizz,
As a final belt treatment to the skis you might try a scotch brite belt. I have one on a grindrite and it takes care of some of the remaining hairs and puts a good buff on the base. Otherwise, now you need to build a stone grinder.
ra

twizzstyle · Post by **twizzstyle** » Sat Jul 24, 2010 4:31 pm

Cool, thanks! I'll see if I can find a scotch brite belt for it.

I got the coolant today, so its not just running straight water any more. I got a gallon of Kleen Kut from Sun Valley Ski tools, I'm pretty sure its just normal anti-freeze though, it certainly looks and smells the part.

krp8128 · Post by **krp8128** » Sat Jul 24, 2010 6:16 pm

Shouldn't they have an MSDS available?

rockaukum · Post by **rockaukum** » Sun Jul 25, 2010 9:32 am

One would think it is required... I recieved the same stuff and did not get a MSDS either. I agree that there is some amount of antifreeze in the mix. When I asked about it (because some people use just anitfreeze and water) the guy was unable to give the properties.
ra

krp8128 · Post by **krp8128** » Sun Jul 25, 2010 9:35 am

rockaukum wrote:One would think it is required... I recieved the same stuff and did not get a MSDS either.

usually you have to request one, but it's a chemical, used in a commercial industry, so I am 99.99% sure there is supposed to be an MSDS available.

twizzstyle · Post by **twizzstyle** » Mon Aug 02, 2010 7:31 am

I've decided I'm going to make an auto-feed for the grinder, just for the sake of having another project.

I leave town in about a week for work, will be gone for about a month, so I'm not sure how much I'll accomplish before I leave, but I have a pretty good game plan in my head. I ordered a urethane feed roller from McMaster, should have that in a few days. Been trying to figure out what I want to source the motor from, I could get just a motor and buy some gearing (worm gear) from McMaster, but the gears on McMaster get expensive.

So now I'm thinking getting an electric winch or hoist from Harbor Freight, that might need more gearing, but it might be just right. Then its just a matter of putting the feed roller on an output shaft, mounting the whole thing on a height adjustable frame with some springs (to allow for ski profile) and done. There is already an attachment point on the grinder (where the edge fence goes now)

rockaukum · Post by **rockaukum** » Mon Aug 02, 2010 8:44 am

Hey Twizz,
Sounds like you could use a "bridge" once you are done with making the auto feed. I may also be able to help out with a counter weight or two (I'll have to check) they came off a wintersteiger...
Try checking into an outfit called "Phoenix phase converters" I got a conveter from them and the pricing was good. I know you don't need a converter but they have motors....
ra

MontuckyMadman · Post by **MontuckyMadman** » Mon Aug 02, 2010 10:44 am

i this the contact wheel?
Extra-Wide Vibration-Resistant Idler and Drive Rollers
4" one?

twizzstyle · Post by **twizzstyle** » Mon Aug 02, 2010 1:17 pm

MontuckyMadman wrote:i this the contact wheel?
Extra-Wide Vibration-Resistant Idler and Drive Rollers
4" one?

Yes. I wanted to get the "self cleaning" grooved one, but it was a bit more money so I just got the plain one. It's about 2" wide, 4" diameter, 35A durometer urethane (the softest urethane one).

I was at Harbor Freight today and picked up an electric trolley thing, just for the motor and gearing (its for gantry hoists). Depending on the output shaft speed of that, I might be set, or I might need to get a worm gear still. I'll see when I play around tonight.

Rockaukum - what do you mean by bridge? I have an idea in my head how I want this thing to work, but I've never looked at an autofeed on a real grinding machine up close, so my idea might be a route to failure.

MontuckyMadman · Post by **MontuckyMadman** » Mon Aug 02, 2010 4:02 pm

bridge is the part that goes over the binder/clamp/binding with use of an autofeed.

twizzstyle · Post by **twizzstyle** » Mon Aug 02, 2010 8:26 pm

MontuckyMadman wrote:bridge is the part that goes over the binder/clamp/binding with use of an autofeed.

Ahhhh yes of course. I hadn't even thought about that, I was just thinking grinding brand new skis (no bindings). Hmmm that means my roller needs to have the ability to move up that high (I was just planning on springs to account for core thickness changes). I'll have to do some more thinking about that.

twizzstyle · Post by **twizzstyle** » Sat Aug 07, 2010 9:38 am

So the electric trolley thing I got isn't geared down enough, I would end up with a feed rate of 16 in/sec. But I'm still going to use the motor because its nice and small.

I decided I needed to get a worm gear to reduce it enough, but they're stupid expensive on mcmaster (on the order of $100 just for the worm gear). I found a worm gear box thing on ebay, 60:1 reduction ratio for $50, so I bought that, should get it in a few days. That'll get my feed rate down to 6 in/sec which I think should be around right.

I did get the feed roller from McMaster though, and its perfect. The 35A durometer is pretty soft, but that should help it stay nice and grippy on the ski. Hopefully coolant spraying on it won't make it slippery, if it does I'll have to cut grooves in the wheel or something.

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Ski Grinder restoration (Complete!)