Flat Grind Heaven!

Hi, Rob and everyone else! I have taken a breather from knives for a about two years and did a bunch of stuff on Ebay, mostly militria, soviet "stuff". well Mr. Frink! did you every finish a working rotary palten for the HARDCORE grinder? You sent me one in the early stages of development. but it was a little off center if I remember right. I would be interested in any new developments! and how you line of Knifemaking stuff has grown! Laurence
 
Hey Rob!
Correct me if I'm wrong, but the reaso this isn't available for Square Wheels is due to the amount of offset required, correct? If that's the case, it can't be too big of a deal to replace the cast armature that the SW uses to mount its contact wheels or platen, right? Judging by the look of your Bader arm, all that was necessary was to reduce the arm thickness at the rotary platen mounting point enough to compensate for it's offset... couldn't the same be done by making a new arm that utilized the existing mounting bolts on the SW setup?
 
RHINOKNIVES said:
Hi, Rob and everyone else! I have taken a breather from knives for a about two years and did a bunch of stuff on Ebay, mostly militria, soviet "stuff". well Mr. Frink! did you every finish a working rotary palten for the HARDCORE grinder? You sent me one in the early stages of development. but it was a little off center if I remember right. I would be interested in any new developments! and how you line of Knifemaking stuff has grown! Laurence
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welcome back Laurence
now lets make some knives:)
 
Hey Rob!
Correct me if I'm wrong, but the reaso this isn't available for Square Wheels is due to the amount of offset required, correct? If that's the case, it can't be too big of a deal to replace the cast armature that the SW uses to mount its contact wheels or platen, right? Judging by the look of your Bader arm, all that was necessary was to reduce the arm thickness at the rotary platen mounting point enough to compensate for it's offset... couldn't the same be done by making a new arm that utilized the existing mounting bolts on the SW setup?
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Yep...that's the basic problem.


Hello Laurence!! Good to see you back!! Your personallity has been missed!!!
 
Hi, Rob and Graymaker. good to hear from you guys! has anyone heard from Bruce Evans? did he get washed away? I emailed him and have not heard a thing back. Also who is selling that pryrex type glass to be used on the palten for flat grinding. I need a few pieces to get rolling again. Laurence
 
RHINOKNIVES said:
Hi, Rob and Graymaker. good to hear from you guys! has anyone heard from Bruce Evans? did he get washed away? I emailed him and have not heard a thing back. Also who is selling that pryrex type glass to be used on the palten for flat grinding. I need a few pieces to get rolling again. Laurence
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haha you remember my old handle :)
Laurence are you talking about the ceramic ?
if so you can get it from Darren Ellis he's one of the members here.
Darren@DarrenEllis.com
Bruce E is still kicking around we've talked on the phone a couple times
a short time back
he's having ups and downs but still making..Donna has a little adventure too but I'll let him tell that if he wants to..
 
Donna in swim wear was always nice!

Donna....not in swim wear? Well, that sounds pretty nice as well.

(respectfully kidding, of course)

I missed seeing Bruce and Donna at the Blade Show this year. In the past, they usually stop by to say hello.
 
rfrink said:
Donna in swim wear was always nice!

Donna....not in swim wear? Well, that sounds pretty nice as well.

(respectfully kidding, of course)

I missed seeing Bruce and Donna at the Blade Show this year. In the past, they usually stop by to say hello.
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:) I'm thinking that doing the internet jig is taking up a lot of his time , and I see all the older guys backing off from it. I'm a knuckle head and slow to learn this or at least put it into practice too..yes those were the days when Bruce was gracious enough to share Donna with us:thumbup:
but am trying to do less of this and more work too :(
 
rfrink said:
This is the result of a discussion a few weeks ago in The Custom Knife Forum about flat grinding.....

The idea was originated by Ken Onion about a "rotary Platen" to eliminate the annoying thump and bump from tradition platen grinders. Inspired and encouraged by Ken and others, I built a prototype and tried it out today.

MVC-844E.JPG


The basic idea is to use a secondary belt like a Tank track which rotates with the abrasive belt. By adjusting the tension on the secondary belt, you can effectively controll the membrane stiffness to appraoch a flat grind.

I started with an industry standard V-ribbed belt...type J, commonly found in machine tools and readily available from power transmission dealers.

MVC-845E.JPG


With mini-"V" ribs on the back side, these belts ride on ribbed rollers and are locked in place side to side as the run. The abrasive belt tracks beautifully....and can be steered from side to side while the secondary belt remains in place.

MVC-846E.JPG


I made the attachmnet with an optional center roller to add more support and to reduce deflection,....for flatter grinds.

MVC-847E.JPG


The tension is precisely adjusted with a sliding bracket and jack screw.

MVC-849E.JPG


I was amazed with the stiffness of the taught belt....with out the center roller.......and even more excited when I put the center roller on.

I just finished it today and I've only used it for about a 1/2 hr. I was most suprised by the whisper quite sound when I first turned it on. No belt rubbing across a platen. Then when I started grinding on it....it felt just like a contact wheel :) :) .

MVC-850E.JPG


Even though it has hardly been tested.....I couldn't contain my excitement and enthusiasm to share it.

I have another in process one with a different type of belt.

So, whatta ya think...? feasible, waste of time? any ideas for improvement. Would you like to see something different...?

I think it is remarkable! I am not the author of this wonderful idea.....I'm just a regular working smuck that built it. Credit for the idea goes to Ken Onion.

Thanks Ken!

Sincerely,
Rob
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Rob, looks awesome. I know what you mean about the platen. Having the rubber belt as a slight cushion would be very nice to grind on indeed. My old home made disc sander had rubber for my backing on the discs and was quite nice to grind on.

P.S. Do you have any time right now to work on that extended work rest for me?

Mike Coughlin
 
I have one and tried it out briefly but could not get the hang of the plunge lines. I need to play with it some more and I'm glad this thread got pulled up to remind me. I'm thinking I have the perfect application for this coming up.
 
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