Rob Frink 9" disc

NickWheeler

NickWheeler

Joined
Dec 3, 1999
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Two thumbs up! :thumbup: :thumbup: :)



While Rob was having his anniversary discount I decided to buy the 9" disc with the beveled face.

I have been using a 9" disc for a really long time... I'm a big advocate of using a disc for flat grinds between grits on the belt grinder to assure flat bevels and ease finishing.

I just used the beveled disc on a 9.5" fighter blade, and it's MUCH easier not having to fight the "uphill side" like with my flat disc.

I got the blade FLAT FLAT... and easily got right into the very tight plunge cuts that I like... with 600X paper. :)

Good stuff... highly recommended. :)
 
Ain't it great Nick!? I got mine last week, and am still learning all the cool things I can do with it....but I've already discovered that it is the BEST disc grinder I have ever worked on. I didn't like the "herky-jerky" I got grinding with paper straight on the disc, and went to the local Ace Hardware and purchased a small roll of cork gasket material and used it as a backing...now she's smooth as silk when grinding.

I wired a foot switch into mine (after Rob saved me from burning the thing up by wiring it the wrong way:eek:) I tried to make the wiring more complicated than it was, and hope to post up a web album of how to wire in a foot switch this week.
 
NickWheeler said:
While Rob was having his anniversary discount.....
Click to expand...

Anniversary discount? Did I miss something? Admittedly, I have only been watching since a little before Christmas, but I have not seen mention of it since then. I am set to pull the trigger on at least one of his grinders but buyers remose stays my hand.....All I need is a little nudge and it looks like I may have missed it:)
 
are you guys using your disc grindersw vertically or horizontally? In light of the recent "how to hook two machines to your VFD controller thread", I am feeling the need to build one using Rob's disc. I am still getting the faint "2 inch disease" and other little divots on some blades and they are a PITA to get out with the belt grinder or by hand.
 
So you got the whoe she-bang Ed? Cool! I was going to, but since I already had a disc set-up with a vari/reversing 1.5 hp Leeson I just decided to stick with that and swap the discs. I wanted to get the entire thing, but I just flat don't have room for another one!

techna- Rob announced in early December that to celebrate 10 years in business he was having 10% off orders until Christmas. I know a lot of folks here took advantage of it. I sure did! :D

Joe- mine is vertical. I had a horizontal set-up about 13 years ago, but I didn't use it much. The vertical I use a LOT. I know some people swear by having them horizontal though... different strokes :)

I grind on mine much like on the 2X72. The main difference is the blade has to be kanted in order to walk up into the plunge (only because I go for the sharp/crisp plunge... the rounded out smooth plunge probably wouldn't need it).

I think the "trick", is that if you get to the disc and seem to be going nowhere, you need to go back to the belt and get closer.
 
Thanks for the plug Nick!!

.......... went to the local Ace Hardware and purchased a small roll of cork gasket material and used it as a backing...now she's smooth as silk when grinding...
Click to expand...

Interesting Ed! Please tell more. You glued the gasket material to the face of the disk, then glued the abrasive to the gasket...? How do you replace the abrasive without peeling up the gasket? 2 different adhesives?

Hmmm interesting!!

-Rob
 
FYI........there is a store on Ebay that has brand new Leeson and Baldor 1hp 1750rpm TEFC motors for like $175.
 
Rob/Pad:

I glued the cork gasket material (its very dense, and less than 3/32" thick) on with 3M 77 spray adhesive, and use the "el-cheapo" Duro spray glue from Walmart to apply the disc(s). The 3M stuff is pretty much a permanent glue, where as the Duro stuff is kind of a "cheesy" glue that doesn't have a lot of "stick". Before the Duro I purchased a can of "lite-tack" from a local NAPA store, but it was $16 for a 6 oz. can! The Duro has about the same amount of "tack" but an 11oz can is less than $5. So far I've put on and pulled off about a dozen discs and/or sheets of sandpaper and its working great.

The idea came from a previous disc grinder I had built.....I had a very thin, desnse rubber backing pad on it, but it didn't seem like any glue would hold it to the disc, and ever time I peeled off a sanding disc, the backing came off with it. The cork is a little porus, and I think it holds the glue better.....so far its not come off with the disc.
 
NickWheeler said:
Two thumbs up! :thumbup: :thumbup: :)



While Rob was having his anniversary discount I decided to buy the 9" disc with the beveled face.

I have been using a 9" disc for a really long time... I'm a big advocate of using a disc for flat grinds between grits on the belt grinder to assure flat bevels and ease finishing.

I just used the beveled disc on a 9.5" fighter blade, and it's MUCH easier not having to fight the "uphill side" like with my flat disc.

I got the blade FLAT FLAT... and easily got right into the very tight plunge cuts that I like... with 600X paper. :)

Good stuff... highly recommended. :)
Click to expand...

Nick.... Advantages, disadvantages between the straight and the beveled disc?? Looking to get one but I have no idea of which one to buy. Thanks..Jim
 
Jim-

The beveled face disc has a 1 degree taper toward the center. So essentially with the regular disc, you can lay a straight edge flat right across the entire 9" surface. With the beveled disc, if you lay a straight edge on it, it would lay flat on 4.5" of it, but be elevated off of the remaining 4.5" surface.

I do a lot of clean-up grinding and truing on a 9" disc. If you put a big 'ol blade on the flat 9" disc, the 4.5" that is turning down runs smooth.... the opposite 4.5" is running "uphill" and trying to push the blade at your face.

The beveled disc totally eliminates this! :)

You can still do all of the regular things you'd want to do with a disc... so as far as I can see... the only real benefit is with flat grinding/clean-up blades... But I can already see it's a small change that makes a HUGE difference.
 
Nick....

Thanks for the help. I will go with the beveled disc to start. Thanks again.
 
Keith_H said:
Quick dumb question, doesn't the paper wrinkle if it is not flat?
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Not a dumb question at all Keith! Rather observant actually :) With just 1degree of taper, it does not wrinkle the paper at all.

I'm using the red Rhynowet stuff from SuperGrit on the disc. I wish I lived close to them like Deker does... I could use some more stuff! :D
 
3M feathering disc adhesive works great, apply it and you can peel discs off
all day without hurting the backing.
Ken.
 
NickWheeler said:
Jim-

The beveled face disc has a 1 degree taper toward the center. So essentially with the regular disc, you can lay a straight edge flat right across the entire 9" surface. With the beveled disc, if you lay a straight edge on it, it would lay flat on 4.5" of it, but be elevated off of the remaining 4.5" surface.

I do a lot of clean-up grinding and truing on a 9" disc. If you put a big 'ol blade on the flat 9" disc, the 4.5" that is turning down runs smooth.... the opposite 4.5" is running "uphill" and trying to push the blade at your face.

The beveled disc totally eliminates this! :)

You can still do all of the regular things you'd want to do with a disc... so as far as I can see... the only real benefit is with flat grinding/clean-up blades... But I can already see it's a small change that makes a HUGE difference.
Click to expand...

Nick,

Because the face of the 1 deg. taper disc is a cone, using it to flatten a guard or spacer or handle end won't work, right? Or am I not getting something?

Actually, I'm having a hard time seeing how a cone flattens a blade instead of dishing it, end to end. like a giant radius hollow grind... ???

Mike
 
Mike Krall said:
Nick,

Because the face of the 1 deg. taper disc is a cone, using it to flatten a guard or spacer or handle end won't work, right? Or am I not getting something?

Actually, I'm having a hard time seeing how a cone flattens a blade instead of dishing it, end to end. like a giant radius hollow grind... ???

Mike
Click to expand...

Ditto :thumbup: Mathamatically, (@ 1 deg.), the "cone" you describe would show .0785 relief on each side if you placed a level straight edge across the top center of the disk. If you layed the straight edge "flat" on one side, as Nick described, you would see a .157 (5/32") gap on the other side.

I've had both the flat and the tapered disk. If you're only going to use it for guards, spacers etc. you may be better off going with the flat disk that Rob sells.



:thumbup:
 
Ed/Nick,
A maker I know has used a 9" disk forever. He has a small pin in the center of his disk and uses magnetic sign material with a hole the same size as the pin in the center of the magnetic disk. Lets him change over quickly. I'm probably going to do the same when I get my 9" disk.
 
I am glad we are having the beveled vs. flat disk conversation as I have been contemplating purchasing one or the other.

Allen
 
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