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Toff
From: United States
Posts: 240
Hello All!
Good Idea but the "Variac" is a transformer that is adjustable as to the output voltage. When you lower the voltage, a circuit/device requires more current in amperes to operate. There comes a trade off where the current requirement is so high that the device either stops operating or goes up in smoke! A "brush type"/"Ac-Dc" motor will operate over a larger voltage range than will a "synchronous type"/ AC only motor. There are a whole lot of reasons for this and I am no longer qualified to even skim over them. That is why the variable speed drill motors seem to work and stop turning at a certain torque/speed point. They are built to accept a short term over current but even they will "toast" if stalled for much longer than it takes to release the trigger. Electronic speed controls operate by varying the amount of power to the motor by changing the shape of the sine wave from the mains.
Respectfully
~~Richard
"Life is a journey between birth and death, preferably undertaken with panache!""
2010-11-24 05:32
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BlacknTan
From: United States
Posts: 176
I stand corrected.

As I said, I know absolutely nothing about electric... I'm glad you responded, because I thought of trying one myself, and was wondering about the implications. You saved me some money! :)
Better a diamond with a flaw than a polished pebble...
2010-11-24 13:40
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Gerrit VanKommer (deighaingeal)
+1
From: United States
Posts: 205
I have a bunch of PWM circuits laying around. When I occasionally pull out a motor for a project it is nice to have them around, but what I find is that with most of my projects I find a fixed RPM and leave it there, so what I end up doing is stealing the same controls from one project to the next then just putting a fixed controller on the previous unit. I will never understand my own actions, I am completely random.:D
As for vibration I think I may mount my grinder on a weldament of tubular stainless steel then fill with sand and seal with plugs to prevent moisture from entering, but removable to ease mobility.
-G
2010-11-24 20:37
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Toff
From: United States
Posts: 240
Hi Gerrit
Good idea about the tubes filled with sand.:thumbup: A large cross section tube ~4"/100mm with 3mm/.125" wall or thicker would be great. I just was reminded about project weight. I moved my 12"x18"x3" 300x450x80mm granite surface plate from its chest level shelf to a bench across the room to lap some stones. Sheeeeze!:thumbdown:
Well, Being completely at random does have some great benefits! If you have a few projects, they will build up till you are forced to continue one or another to get out from under or to pass bye or over them, in my case!!
Respectfully
~Richard
"Life is a journey between birth and death, preferably undertaken with panache!""
2010-11-24 23:13
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Gerrit VanKommer (deighaingeal)
+1
From: United States
Posts: 205
Ouchy! When I worked as a cabinet maker I installed marble and granite counter tops...by hand. try a 4 foot by 8 foot by 2 inch thick piece of granite. That always ruined my day. I actually broke my back years ago, so when I build tools I find ways of making them more mobile.
-G
2010-11-25 00:29
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Toff
From: United States
Posts: 240
Oooh Ow!
Respectfully
~Richard
PS Here in the USA Thursday is our day of giving thanks for all that we have been given and allowed to work for. thanks to all for being a part of my life!
"Life is a journey between birth and death, preferably undertaken with panache!""
2010-11-25 05:42
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Dr Ralfson Bwhahaha (tat2Ralfy)
Associate
Posts: 3610
iconToff:
Oooh Ow!
Respectfully
~Richard
PS Here in the USA Thursday is our day of giving thanks for all that we have been given and allowed to work for. thanks to all for being a part of my life!


Thank you Richard, for being a part of ours

Regards and happy thanksgiving
Ralfson (Dr)
We Are All Pioneers In Our Own Right.
The Infamous Coticule Crew
Pip Pip Old Bean
2010-11-25 09:10
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jeness
From: Hungary
Posts: 105
Just found this thread, and made a similar setup to this. How long do these rolls of sandpaper last? Can you do a blade with one roll of each grit, or I have to change paper during a restore?
2011-07-30 12:01
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Smythe
Advisor
From: United States
Posts: 990
Oh that reminds me…
There are a few restorers who grind new or re-grind vintage blades using a lathe. If you are also inclined to grind blades you can build your own wood turning lathe powered by a portable drill.

Or… if you are so inclined to “buff” (yyuuck!) razors, at the very least, the mandrill is at a low-rpm/high-torque, so there is less chance of drawing the temper.

Found in an old Popular Mechanics Magazine here:
http://books.google.com/books?id=9tsDAAAAMBAJ&pg=PA196
(Special thanks to Google Books).

For the benefit of our non-US members who may not be able to open the link, here are legible JPEG scans of the relevant pages.

2011-07-30 18:47
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randydance062449
Posts: 22
Congratulations on your ingenuity! I have something similar but mine is using a small pen makers wood lathe with variable speed control. One suggestion if I may....put some soft cushioning material between the wheel and the sandpaper. Use the 2 sided tape again. That will allow the sandpaper to conform to the specific curvature of the razor. It results in a much more uniform contact on the blade. As you know this process is much faster than buffing with greaseless buffing compound or the scotchbrite wheels.


OOOPS! I did not notice the other 2 pages of posts! Sorry.
[Last edited by randydance062449, 2011-09-15 06:51]
Randy Tuttle
randydance@comcast.net
2011-09-15 06:38
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Bart Torfs (Bart)
Associate
From: Belgium
Posts: 5001
iconrandydance062449:

OOOPS! I did not notice the other 2 pages of posts! Sorry.

It's great to hear from you anyway, Randy. :) Purely coincidental, was rereading one of your older posts yesterday and wondered how you'd been.

All the best,
Bart.
Then the light shone, trumpets sounded and I got to the other side, where men shave with smiles on their faces, razors pop hairs, and a continuous choir singing «~~Keen and Smooth~~» is heard everywhere. (Matt)
2011-09-16 11:10
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urmas
From: Estonia
Posts: 205
Thanks Randy.
But the original idea is not from me. :)

For cushioning I'm using white foam based duble sided tape. I noticed that with cushioning the sandpaper works somewhat longer too.

Regards,
Urmas
2011-09-16 14:01