Roger
fully equipped rock polisher
Member since August 2005
Posts: 1,775
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Post by Roger on Jan 3, 2008 19:00:51 GMT -5
I bought a 24'' well used Highland park saw.It cuts everything 3 to 4'' size no problem anything larger it labors real bad ,like heats up the motor. So I try a new motor....same problem everything seems to measure straight.Any suggestions..............Roger
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rallyrocks
fully equipped rock polisher
Member since November 2005
Posts: 1,507
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Post by rallyrocks on Jan 3, 2008 19:11:46 GMT -5
Can you adjust the feed rate?
I would expect for a given speed of blade, that larger pieces should get fed slower, but then again I'm not really an expert in big saw behavior quite yet...
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JEFFD
starting to spend too much on rocks
Member since December 2004
Posts: 242
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Post by JEFFD on Jan 3, 2008 19:28:15 GMT -5
The first thing would be sure you have the belt on the slowest feed rate if you have 3 or 4 pulley sizes it would be the largest.
Next take a felt tip marker and put it in the vice, then push it across the blade. It should run true all the way across. Also take a level and check that the blade is straight up and down.
Might want to take the blade off and lay it on something flat, make sure the blade isn't dished.
If that doesn't work I'm out of ideas.
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mike4bears
spending too much on rocks
Member since December 2007
Posts: 275
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Post by mike4bears on Jan 3, 2008 22:04:32 GMT -5
had the same trouble with my 12in lortone it was the rock vise out of alignment. for a large rock it has to be dead on. the felt tip marker is a great idea. mike
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Post by bobby1 on Jan 4, 2008 7:56:13 GMT -5
Also, the blade could be worn badly where there is no kerf width to provide clearance for the blade to pass through the stone. Or a dull blade?
Bob
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Post by bobby1 on Jan 4, 2008 7:56:46 GMT -5
Also, the blade could be worn badly where there is no kerf width to provide clearance for the blade to pass through the stone. Or a dull blade?
Bob
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Roger
fully equipped rock polisher
Member since August 2005
Posts: 1,775
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Post by Roger on Jan 4, 2008 9:45:01 GMT -5
Thanks for some great tips.I checked the blade and it is dished@#* So I guess I cut smaller rocks and save $$$ for a new blade.....Roger
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Post by texaswoodie on Jan 4, 2008 9:47:51 GMT -5
I had the same problem with my 14" saw. Found out I had a dished blade.
Curt
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lsmike
spending too much on rocks
Maxwell's demon lowers tumbling entropy
Member since January 2007
Posts: 468
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Post by lsmike on Jan 19, 2008 10:21:19 GMT -5
All good advice.Also make darn sure the rock is TIGHT in the vise{auto-correct: MOV files not allowed}ement causes labored cutting and dishing.Mike.
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Old Hickory
having dreams about rocks
Member since March 2006
Posts: 67 
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Post by Old Hickory on Jan 31, 2008 0:53:54 GMT -5
I don't know about adjusting the feed rate on the 24" Highland Park but I have a 14" HP that has a three step pulley on the feed screw input shaft with a belt tensioning arm that allows you to adjust the feed rate without changing belts. The pulley is hidden under a cover and it is hard to see.
Old Hickory
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Old Hickory
having dreams about rocks
Member since March 2006
Posts: 67
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Post by Old Hickory on Jan 31, 2008 1:17:57 GMT -5
I just checked some information I have on Highland Park Slab Saws. I got this information from Diamond Pacific who holds the rights to the old Highland Park saws.
In the operating and maintenance instructions it states under(Power Feed - V-belt adjustment)
Highland Park Slab Saw power feed systems are equipped with a three step pulley (5", 4", 3") to provide three in-feed speeds to accommodate various rock hardnesses. Use the table below for selection of in-feed speed.
5" - 7 (MOHS) or harder.
4" - 6 (MOHS)
3" - 5 (MOHS) or less.
Hope this helps - after you get your blade issues solved.
Old Hickory
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