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hardtail
12-23-2010, 02:45 AM
I recently purchased and recieved today a set of blocks like these (not the actual vendor just appears to be a similar product).....they appear to have no magnetism. Does anyone have a similar set and can comment on their abilities. I'm not sure if they are just intented to be a magnetic medium mounted on a magnetized plate but in their present state appear to be useless as far as the magnetic part? Perhaps I should have opted for the DI base style with the switch......

http://cgi.ebay.com/PAIR-MAGNETIC-V-BLOCKS-2-3-8-X-2-X-1-7-8-IN-0135-/250648318313?pt=LH_DefaultDomain_0&hash=item3a5bcdd169

macona
12-23-2010, 02:51 AM
Those are for use on magnetic chucks. They are laminated so the magnetic flux passes through and to the work piece you are grinding.

hardtail
12-23-2010, 02:56 AM
Thx well I guess I'll put them away and have to order the other type which should benefit me better.....

Spin Doctor
12-23-2010, 07:53 AM
For use on surface grinders. But IMO the comercial ones are poorly designed. When I made my own I had one side of the Vee short so as to allow more flexibility of use. Plus I made a lot more than just 45D.

bborr01
12-23-2010, 12:31 PM
Go to ebay and search "magnetic v block".

A Brown and Sharpe used is about $175.

Imports are around $30.

They have a knob that turns to actuate the magnet, much like some magnetic bases.

Brian

JCHannum
12-23-2010, 01:05 PM
Do be aware that the magnetic V-blocks with magnets are still only suitable for use on a grinder. They do not have the holding power for more vigorous machining.

Peter S
12-23-2010, 07:55 PM
Hardtail,

The ebay ad is really mis-representing the items calling them "magnetic v-blocks". They should use the term "transfer blocks" or something similar I reckon.

smalltime
12-23-2010, 08:56 PM
One other thing that should be mentioned:

With transfer blocks, the laminations need to be running the same direction as the laminations in your magnetic chuck. Otherwise......BOOM!:eek:

PixMan
12-23-2010, 09:57 PM
One other thing that should be mentioned:

With transfer blocks, the laminations need to be running the same direction as the laminations in your magnetic chuck. Otherwise......BOOM!:eek:

I had picked up this little collection for about $40 (shipped) and was surprised to find they actually DO work at 90 to parallel with the laminations. While it's not 100% of the transfer that I get when used in the "proper" orientation, they do still have plenty of holding power for smaller parts and light passes.

http://img.photobucket.com/albums/v466/kenm10759/Dads%20shop/IMG_0301-r.jpg