jawsjr
starting to shine!
Member since June 2019
Posts: 44
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Post by jawsjr on Dec 6, 2020 13:35:33 GMT -5
I am in the process of rehabilitating a 1970's era Highland Park 18" Square Rail Slab Saw. I have replaced bearings, removed a lot of the old gunk and new belts, cleaned the worm and ring gear and installed a brand new blade. I am wanting to to two things now. 1) make sure the carriage is perfectly lined up with the blade and 2) double checking the blade itself to make sure that it is not warped. I decided to do #2 first before I do #1. I have included a video showing one full rotation of the saw blade. from this starting point there is 0.65mm (0.0256 in) negative and 0.7mm (.0275 in) positive. Is this within tolerances for the straightness or deflection of a blade? There is a total of 1.35mm (.0531 in) of warp in this blade which is 1.63mm (0.064 in) thick.
I am looking forward to any feedback.
Thanks!!!
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quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,332
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Post by quartz on Dec 6, 2020 15:42:55 GMT -5
One thing to check is the inner collar that supports the blade. I haven't replaced many rock saw blades, but that seems to be a lot of runout for a new one. I worked as a millwright and machinist in a sawmill, saw lots of warped saw collars there. The mill saws and rock saws are attached to the arbors the same way.
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Post by mohs on Dec 6, 2020 15:51:44 GMT -5
You have the indicator point out at the rim of the saw Which is good
But I would think you’d want the blade to run truer than that
In wood cutting blades they have a method Where they roll the rim of the blade to stiffen the action at the rim of the circular saw.
Its pretty expensive complicated piece of machinery
don’t know much about lapidary blades
But wonder if any manufactures of lapidary blades do that procedure? Especially on larger diameter blades?
Anyway best to ya on that refurbishing Looks like you made lots of fine progress
Ed
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Post by parfive on Dec 6, 2020 20:40:29 GMT -5
I’d see what it looks like first when the blade’s running at speed.
See what it feels like when you hold a fingernail out where you have the indicator point. It may run truer than the static reading.
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Post by roy on Dec 7, 2020 11:44:58 GMT -5
all though thats not the way you align the saw each blade will have what looks like a wobble take the blade off put it on a flat surface put a straight edge on it then you will know whats up
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