Grinder help

[Robert Coleman]

Hello Group!
I need some help/insight. I recently had a new "disk" or plate made for my 24" Somacca horizontal grinder. It is of a hardened SS, about 2.5" thick, and as mentioned 24" in D. Here is the problem. It seems that I am losing my work more then usual. I am not sure that it is hydroplaning. What happens is that in an area close to the inner portion of the wheel a piece gets grabbed out of my hand. It seems to sort of stick and then it's gone. More often this is at the beginning of the grind when the area being ground is about 1/2 to 3/4 of an inch.. Am using 100G silicon carbide btw. I think I have the water drip ok and I am wondering if any of you have any insight or suggestions. I don't think I am pressing too hard (have varied that in order to solve the problem which it didn't) and what I saved in having the plate made myself I am now losing in ruined pieces! Thanks, Bob

[Pete VanderLaan]

The stainless steel is most likely the problem Bob. I make those wheelheads out of mild steel or cast iron. I once had a moly steel plate and I couldn't use it , having the same things happen that you describe. Stainless tends to sort of peel off and grab really hard. I hate to say it, but change the head.

[Hugh Jenkins]

Before you deep six this thing, try a coarser grit, like 50 or 60. They roll more freely and may keep the work from grabbing so badly.

As wheels wear, the center can form a bit of a dome for lack of wear. That will cause more pressure on the inner edge and grab. Try taking the center area down with an angle grinder.

[Brian Blanthorn]

SS is a realy weird material

It is actually fairly soft

But appears hard when drilling

I think it is in fact very dence n closely packed n very smooth wheras cast has a grain structure

U could try running a cource grit over it frequently 2 give a bit of bite

Use a courcer grit pre the 100 which is very fine 4 a flat bed

Then just finish on 100

I wouldent really finish on 100 anyway

But U may try a very very small ammout of wash up liquid I use a bio one as it keeps my hands soft

Another thing I would recomend is a bar over the flat bed

Here is my set up

http://www.blanthorn.com/making/making_pebble_w283.htm

U can rest the work on this a bit mayb tape it up if U fear scratching

Why U wanna finish on 100 what u doing next

U could try slowing bed down to say 150 rpm on plate + champher edges of peice

Another thing we do here is use a wheel hub from car ---- off wheel but just on centre 2 flat off bed it turns also


U would have trouble using 100 grit on any surface


Brian