PDA

View Full Version : Made that improved grinder finger support I wanted.



J Tiers
09-01-2016, 07:30 PM
Made an improved grinder finger support for the Greenfield tool grinder. The finger has a snug to hold it in the inner sleeve, and there is a knurled nut to raise and lower the inner sleeve. When at the right height, a snug in the outer sleeve holds the inner sleeve and finger in position. I was going to key the inner and outer, but the flat for the second snug does almost as well as a key would, so I am leaving it for the moment. The inner one has no flat on the finger, it might be at any angle.

The thread is 0.625-20, so one turn is 0.050". When the dividing head is freed up from what it is being used for now, I will engrave dial marks on the nut, and install a block with an index mark..

http://img.photobucket.com/albums/0803/jstanley/tooling/shop%20made%20tools/Greenfield%20finger%20base%201%20IMG_3848_zpsctfgz 6at.jpg (http://smg.photobucket.com/user/jstanley/media/tooling/shop%20made%20tools/Greenfield%20finger%20base%201%20IMG_3848_zpsctfgz 6at.jpg.html)

http://img.photobucket.com/albums/0803/jstanley/tooling/shop%20made%20tools/Greenfield%20finger%20base%202%20IMG_3848_zpsbapit ief.jpg (http://smg.photobucket.com/user/jstanley/media/tooling/shop%20made%20tools/Greenfield%20finger%20base%202%20IMG_3848_zpsbapit ief.jpg.html)

http://img.photobucket.com/albums/0803/jstanley/tooling/shop%20made%20tools/Greenfield%20finger%20base%203_zpss6jlasdc.jpg (http://smg.photobucket.com/user/jstanley/media/tooling/shop%20made%20tools/Greenfield%20finger%20base%203_zpss6jlasdc.jpg.htm l)

10KPete
09-01-2016, 08:26 PM
I like the way you work; you make thumbscrews the same way I do! ;)

Pete

Mcgyver
09-01-2016, 09:03 PM
looks good.

consider a mod.....put it on a spring loaded hinge between body and bracket. If you are dragging a cutter along the helix of the tooth it doesn't much matter, but other jobs (like reamers) it is very handy to pull the rest out of the way for indexing

J Tiers
09-01-2016, 09:27 PM
I generally use a springy end on the finger, so all I have to do is just turn the cutter or reamer, and the finger springs past the flute, and snaps to position ready to locate the next one.

The one shown is shorter and not as springy as usual, but works if near the outside edge.

RB211
09-01-2016, 10:04 PM
Can you post a picture of it in situation so I can see what it is for?

J Tiers
09-01-2016, 10:25 PM
Can you post a picture of it in situation so I can see what it is for?


Look here. That's the prior version without the screw adjust system.

http://bbs.homeshopmachinist.net/threads/71358-Reamer-grinding-kludge-tool

The reason for the screw adjust is that you usually need to set the edge you are sharpening at an angle to make the wheel give it the proper relief. You do that by raising or lowering the finger, so that it holds the cutter in a rotated position so the relief will be ground at the right angle.

With the setscrew adjustment, that was a nuisance. With this one I can set it level (zero relief) then adjust a known distance in thou to put it at the correct angle. I think you can see the center height reference in one of the pics, it is a curved arm mounted on a base that can be set on the table, and reaching over to give a reference for setting the finger or adjusting table height etc as needed.