My slow speed diamond disc lapping machine, the beginning

Braeden P

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Sep 1, 2020
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Those sandvik blades are nice I was given one that was already ground on both sides so no I just need to make a holder.
 

Janderso

Jeff Anderson
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Mar 26, 2018
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6,853
Those sandvik blades are nice I was given one that was already ground on both sides so no I just need to make a holder.
I bought the Sandvik hand scraping handle and blade before Richard Kings class. If you are going to spend some time hand scraping, you'll want to customize the commercial varieties. Most guys like a handle with a little flex. The belly pad also helps.
I would like to hone my scraping skills before I forget I ever learned how. There is a lot to it!!
 

Janderso

Jeff Anderson
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Mar 26, 2018
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6,853
All done.
I've shaped the Sandvik to a 60 degree curve with the 600 grit then polished/honed it with the 1,800 grit.
I use the angle tools in the set I bought. This pic is showing a 4 degree negative angle so I can put two edges on the blade.
This baby is awesome. I'm pretty proud of it.
I had help with the electrical wiring. I'm no electrician.
I think I have about $300 in it.
 

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dewbane

Michael McIntyre
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Mar 2, 2018
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167
I found the motor after a long search on EBay. It’s new, made in The States and I paid less than $160 delivered, I think.
Funnily enough, I discovered your project on the same day I got a free random motor. That looks like an excellent machine to use. I've only glanced through the thread at this point, but I like the design, and I feel like I can feel it through my computer screen. It feels crisp, solid, and accurate. You did a nice job on that!

What kind of torque does your 90 RPM motor develop? The data plate on mine is illegible, and I have no clue how fast it turns, but it's probably way too fast. I would have to gear it way down, which would increase the torque considerably. That seems acceptable for something like this. I have a commercial diamond knife grinder whose wheels bog down at the slightest touch, and it would be better with more torque.

I think I have a use in mind for this free motor. Now I just need to source some free metal that's nice and rigid. Well thanks for giving me something to think about, and congratulations on a really nice build!
 

Janderso

Jeff Anderson
H-M Platinum Supporter
Joined
Mar 26, 2018
Messages
6,853
Funnily enough, I discovered your project on the same day I got a free random motor. That looks like an excellent machine to use. I've only glanced through the thread at this point, but I like the design, and I feel like I can feel it through my computer screen. It feels crisp, solid, and accurate. You did a nice job on that!

What kind of torque does your 90 RPM motor develop? The data plate on mine is illegible, and I have no clue how fast it turns, but it's probably way too fast. I would have to gear it way down, which would increase the torque considerably. That seems acceptable for something like this. I have a commercial diamond knife grinder whose wheels bog down at the slightest touch, and it would be better with more torque.

I think I have a use in mind for this free motor. Now I just need to source some free metal that's nice and rigid. Well thanks for giving me something to think about, and congratulations on a really nice build!
Thanks,
I have plenty of torque, no worries there.
The table pulls back for access to change discs. I think I added four magnets, you only need two. The register is snug so they don’t move at all on the flywheel.
It’s great for touching up carbide lathe tools and honing to a super sharp edge.
I’m very happy with it.
 

dewbane

Michael McIntyre
H-M Lifetime Diamond Member
Joined
Mar 2, 2018
Messages
167
I have plenty of torque, no worries there.
My question about torque was more on the lines of ensuring I have enough torque. Anything I build will be a ghetto version of yours. I want to make sure it has a useful amount of torque. I will have to make mine out of table scraps, rejects, and dumpster finds, unless my employer actually gives me a 212% raise so I can keep up with inflation.
 

OCJohn

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Dec 6, 2021
Messages
63
Jeff, I'm not seeing registration holes on your disc like Stefan Gotteswinter uses. Do you find your magnets are enough to keep the disc from spinning on the platen? (Are you using double sided discs? I assume that would help as well...) I hope that's the case. Seems like a PITA to have to drill the discs before they can be used...
 

Janderso

Jeff Anderson
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Joined
Mar 26, 2018
Messages
6,853
My question about torque was more on the lines of ensuring I have enough torque. Anything I build will be a ghetto version of yours. I want to make sure it has a useful amount of torque. I will have to make mine out of table scraps, rejects, and dumpster finds, unless my employer actually gives me a 212% raise so I can keep up with inflation.
Boy, no kidding about inflation.
I think about relative cost vs. income.
Example, I was making $36,000 a year in 1987. We bought our first home for $91,000. Nice 3 bed. Two bath with almost an acre in the foothills of Northern Ca.
I retired last year making about $105,000.
That same home is available for $560,000.

Look at the number of years it would take to pay off the house with full gross earnings.
Something is broken.
Gas, food, housing, taxes,…….

Tell me about your motor.
 
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