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Techniques for CollectorsStar Diamond ST20 slab saw

1st Jan 2013 03:27 UTCHenry Barwood

I have cleaned up a very old Star Diamond ST20 slab saw and would like to use it for slicing rocks. When I tried it out the blade jammed after just a short distance and the motor belt pulley just spun. I have no idea if the belt is just old, the motor is undersized or there is a mechanical problem. The blade is not obviously dished and the power feed seems like it is set properly. Any suggests as to how to fix this problem would be welcome.

1st Jan 2013 05:29 UTCRick Dalrymple Expert

Troy,

I believe your blade is out of alignment. Clamp a pencil in the vice and put it right up to the blade at the very front. Make sure it is touching the blade at the front but not the diamond kerf. Now push the vice to the rear. If the pencil does not stay against the blade or if it pushes into the blade really hard the blade is not aligned front to back.


To adjust it you have to loose the arbor bolts and adjust it so that the pencil will run the length of the blade perfectly.


I hope that my directions help. If I didn't explain it well or if you have more questions just let me know. You can call me if you would like 801-355-7952.

1st Jan 2013 14:05 UTCHenry Barwood

Hi Rick,


I'll give that a try and see what happens. Thanks.


Henry

1st Jan 2013 15:05 UTCWayne Corwin

Henry


Another thing it could be, is the blade old and has no kerf left to it?


Wayne

1st Jan 2013 18:46 UTCHenry Barwood

Hi Wayne,


That was one of my first thoughts, but the blade is hardly used.

1st Jan 2013 20:29 UTCJohn Truax

Hi Henry,


Ricks advice may get you sawing, you could also check:

Test that the rock sled is sliding freely past the blade. Check the motor to see if it is excessively hot. You could try to give the blade a sharpen by making a cut into an old grinding wheel. Are there any bearings or bushings that are worn? One other thing to try is flipping the blade.


J T
 
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