Final grinder

[cutter]

Originally Posted by cramd

Rod,I am one of those people that have to see something in operation;I'm not so good at visualizing something from a description.
What I see in your video is some great design/fabrication in action.
You should be very proud of this grinder, and I am more than sure that Old Man would have been also.

Thanks, Dave.
You know, I still sometimes expect to see Old Man's green light on when I check in late late at night.

Originally Posted by allessence

Hey Rod, That finial grinder is taking on a life more it's own all the time.


Next thing you'll be saying is you have Final grinder taking Wilson out for walks.

Jenn, I can handle the walks but I'd be very happy if he could just finish Wilson's potty training.

Originally Posted by Whitetrash

Very nice, the amount of thought and work you have put into each component of the final grinder is really impressive. I have seen a lot of commercially produced equipment that isn't nearly as well planned out or executed. So much stuff is planned around bottom line cost instead of what would be best nowadays.

Tim, I have a secret advantage: I don't have to please anyone else or follow anyone's schedule or make them any money.
Damned good thing, too. I'd sure hate to think I was trying to make a profit on this thing.

Originally Posted by Charlie C

I like it, Rod. Almost wished that I had seen one of those before I built my sander but I don't have any gripes about the one that I did build. I have not changed anything on mine in 20 years so I must have done something right. One thing that I may change is how the sanding belt tightens, I like the tightener that you built. I may steal it.

Knock yourself out, Charlie.
Truthfully, I've pretty much stolen or adapted almost every part of this project so this is a good time to point out again that the basic grinder & both tracking rollers should be credited to Bill Pace, Old Man and digr. They worked out the vertical grinder for all of us.

The tension spring idea came from KMG and so did the inspiration for the attachment with changeable forward rollers. I did not use their configuration but I did draw from the design of the Beaumont grinder & adapted it to my available materials and tools, which I'm trying to learn to use as I go along - the Indiana Jones Adventure method.

[cutter]

Originally Posted by Jim-TX

Very nice Rod. It runs smooth as silk.

Jim, I am surprised and very pleased that the forward rollers run so quiet & smooth.
The little 1.5 inch-er is running too hot to suit me and part of that seems to be too tight a fit on the axle/bearings. I can fix that part but the rpm's may just be too high for the bearings to stay cool.
The 2.5" roller runs cool.

Originally Posted by Jim-TX

What color ya gonna paint it?

Flambeau Red. I'm waiting to see if Kevin has any left over.

[getatorch]

Neat video! Very nice ease of set up on that grinder attachment. You always will get much use from a good grinder like that. Like It!!

[~Stick/MIG~]

Originally Posted by cutter

And finally, I shot a little video just to demonstrate the changeover from using the vertical belt to mounting the attachment with the larger roller.

I tried to go slowly and deliberately but still muffed a couple of moves.

Attachment .wmv about 7mb

WOW!!... The video was nice!... It was great to be able to see some real action from the grinder!... That is very nice!, and I can't quit saying what a great job you did!!... And the changeover was very simple and QUICK!!

That's something that you ''should be proud of'', and I'm sure Old Man would be!... It's priceless!!

Thanks for taking the time to make the video!.. I really enjoyed it!

Bill

[engineman56]

Originally Posted By Cutter Flambeau Red. I'm waiting to see if Kevin has any left over.


LOL My first thought was at least you'll be able to see it out in the shop. If I have any left I'll ship it to Lubbock. I think a flat rate box is in order. LOL

Kevin

[Charlie C]

Rod, sitting here and thinking about your grinder and how much noise that the first part of the video was making brought up this idea.

Have the wheels been balanced? They maybe just a tad out of balance, not enough to cause a vibration that you would feel but would cause a lot of noise.

[cutter]

Charlie, I'm pretty sure the top tracking roller noise is caused by the cheap aluminum-cased flange bearings that Jerry used when he made it. They're already slinging grease.
I was surprised that he used them.
I intend to replace them at some point

[GWIZ]

Originally Posted by cutter

The little 1.5 inch-er is running too hot to suit me and part of that seems to be too tight a fit on the axle/bearings. I can fix that part but the rpm's may just be too high for the bearings to stay cool.
The 2.5" roller runs cool.

Are you using rubber sealed bearings or steel shielded ?
I know rubber sealed bearings can generate too much heat.

I replaced the bearings in a high speed grinder but decided to go from shielded to rubber sealed, the grinder got so hot you could not hold it in your hand, I ended up removing the rubber seals on one side of the bearings that were not exposed to the outside grit. that cut the heat down 50%

Now is a good time to use your IR temperature meter.

[cutter]

Originally Posted by GWIZ

Are you using rubber sealed bearings or steel shielded ?
I know rubber sealed bearings can generate too much heat.

Nope, wasn't that and they're steel shields.
I just screwed up the arbor diameter; got them too big. My calipers said they were .001 over but they went on very tight. I turned them to .394 & they were still too tight so I finally just lopped them down to sloppy fit & went down to Lubbock Gasket & bought some Loctite 620.
That seems to have cured the problem.
I retired one bearing that seems to be ruined from my abuse.

This is the 1.5" roller and it still doesn't run as smooth as the 2.5" & probably never will. It is turning pretty fast at almost 10,000 rpm.

[DrBob]

Rod, I KNEW that when I saw it working I'd understand it! Now I know what that fancy latch mechanism does and why you wanted this attachment in the first place. Very very cool.

DrBob


Unnnngh oooooh ughhhh I TRIED to keep my mouth shut but just can't! Could you see your way clear to installing a small guard above the on/off switch? With the new attachment in place your hand goes very close to the belt when you switch the grinder on! I can just see the skin abraded off your hand and wrist I just watched the video again (cool!) and it appears that when you reach for the switch, your inner elbow is actually pressed against the abrasive strip and roller. Perhaps this is an illusion of the camera angle, but maybe you could just completely relocate that switch.

R.