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Ski grinder project - Page 7

post #181 of 205

SWEET!

 

Build some flex into the guide if you want to.  Fasten one end solid,  and  slot the other end.

 

Pressure at the top of the arch will translate into linear motion at the free end.

The "fastener" at the free end just needs to have a close fitting collar.

;-)


Edited by Cgrandy - 3/18/16 at 8:19pm
post #182 of 205
Thread Starter 

And some kind of a spring to bring it back?

post #183 of 205
Thread Starter 

Frames plates, CNC oxy-acetylene cut from quarter inch steel. It's coming along..

 

post #184 of 205
Thread Starter 

MIG welded and painted the frame today. 

 

 


Edited by cedrico - 3/25/16 at 4:30am
post #185 of 205
Thread Starter 

post #186 of 205

:popcorn The entertainment continues.  Nice work!

post #187 of 205
Thread Starter 

Fabrication is almost done :)

All that's left is to adjust things, add the water system, dress the stones, and test the grinder on skis!

 

Here's a video of the grinder spinning fairly smoothly at 1100 rpm: https://www.youtube.com/watch?v=xXtaJa7-jTY&feature=youtu.be

 

And here's the grinder:

post #188 of 205

Nice!

 

Protect those electricals when water starts splashing.  Cut up a plastic jug to hug that open frame motor.

 

I want one!

post #189 of 205

Fun fun fun.  :popcorn

post #190 of 205
So is the ski going to be run over the stationary grinder?
What's the weight?
post #191 of 205
Thread Starter 

Yup, ski grinder doesn't move.

It's pretty heavy because of the 1/4" steel frame. A production version would have a sand casted aluminum frame or something of the sort.

post #192 of 205

Nice cast iron frame.

Cast iron dampens vibration much better and has 3x the modulus.

Easily sand cast if you can find someone that can pour it.

post #193 of 205
Thread Starter 

This one's not cast but thanks!

post #194 of 205

I just realized that you are also in Ottawa. Maybe I will get a chance to see this thing in person.

post #195 of 205
So has an attempt been made to grind a ski?
If so, what's happened?
post #196 of 205
Thread Starter 

@ZeroGravity For sure, shoot me a PM and we can coordinate when you can pass by uOttawa.

 

@Tog I have tried but it doesn't work b/c the stones aren't dressed and the whole setup might need a bit of balancing. I'm still waiting for a dressing stick in the mail. I ordered one a month ago that never showed up but luckily we have backup orders b/c we knew not to count on the chinese folks too much.

post #197 of 205
For balancing there is an app for the iPhone that uses motion sensors built in.
post #198 of 205
I use a wine glass half full to balance. Once you are satisfied, drink the wine.
post #199 of 205
Quote:
Originally Posted by Chenzo View Post

I use a wine glass half full to balance. Once you are satisfied, drink the wine.


Ha ha.  this is great.  Can't wait to see it work!   :popcorn

post #200 of 205
Thread Starter 

Here's a bunch of slides that sums up the project: https://docs.google.com/presentation/d/1zBdf9rpiN9q3himpSHo2mv4o79B3D-dD-BD1aw0MY44/pub?start=false&loop=false&delayms=3000

 

The last slide thanks my prof, the machine shop techs, and you guys! :)

 

Hopefully I'll have an update on how well it grinds in the next few weeks.

post #201 of 205
Quote:
Originally Posted by cedrico View Post
 

Here's a bunch of slides that sums up the project: https://docs.google.com/presentation/d/1zBdf9rpiN9q3himpSHo2mv4o79B3D-dD-BD1aw0MY44/pub?start=false&loop=false&delayms=3000

 

The last slide thanks my prof, the machine shop techs, and you guys! :)

 

Hopefully I'll have an update on how well it grinds in the next few weeks.


Waiting to see how a grind goes!

post #202 of 205
Thread Starter 

My buddy who has the grinder tells me this: It grinds skis, just not flat enough to be considered a good grind. Its much better for sidewall grinding than base grinding.

 

I guess the final verdict is that it's not a successful DIY grinder but interesting experiment nonethless.

post #203 of 205

Thanks for the update.  Don't let it get you down.  Keep up the sharp thinking.

post #204 of 205
Thread Starter 

Thanks Jacques :)

post #205 of 205
Quote:
Originally Posted by cedrico View Post
 

Thanks Jacques :)


I hope you got a good grade with that project!  Take care now.

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