racking my brain

M. Roberts · Oct 20, 2021

magnetic parallels for surface grinder

Hey people,

Midway thru another week. Back in the day, in the shop where I worked, we had a set of parallel bars used for holding parts on a magnetic chuck....easy you say, a dime a dozen....not so fast! These parallels were unique; one edge was serrated (not sharp though) and they were thinner in the center, along the length, and were manufactured slightly bowed...when you put them on the chuck, and it was energized, the parallels flattened out, providing some downwards pressure on your work...has anyone any knowledge of anything like this?

Thanks in advance,
Mark

AJ H · Oct 20, 2021

They are called "Perma grips" still sold by Magna Lock, they are not cheap though

michiganbuck · Oct 20, 2021

Better Title:
"Hold down parallels for use on the magnetic chuck (?)

Or the answer should be to "Go see a doctor".. *or your post locked before you get an answer.
Nobody will search Brain Racking..A member since 2012 you should know better than such a poor title.
Shame on you, bad, bad, bad....No desert for you, and go to bed now..... End of rant.

*You can/should go back and change your title*. This is an important thread and should not be lost...
->Click on Go Advanced edit.

Some grinder guys also called them chuck or hold-down combs.

Workholding & Machine Tools | Rockford, IL | Magna-Lock USA

Also, a good hold method is the have a bump stop in the go direction that is end angled upward so the part touching is touching at the part top edge, just below the grind size target.
Buck

M. Roberts · Oct 20, 2021

Buck,

Thank you for the constructive criticism point taken.

Mark

stephen thomas · Oct 21, 2021

...has anyone any knowledge of anything like this?

Yes.
I've posted pix of using them a number of times, for bronze.

Here's from a few days ago if you just scroll down:
holding small flat brass parts for surface grinding

Ralmikes Tool-a-Rama used to sell them, as did, IIRC, DoALL.

I know they come up online though no longer cheap.

smt

Janderso · Nov 1, 2021

Robin Renzetti made a set on his youtube channel.
Very hand to have

dian · Nov 1, 2021

you can also use two thin, sharp blades that you press into the work and lock down on the chuck.

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