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Circular saw blade sharpening machine.
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Previously:
https://www.homemadetools.net/forum/...0714#post73000
https://www.homemadetools.net/forum/...038#post120318
looks like it works great for a blace designed fo cutting paneling but I wonder how well it would work for blades with set in them for cross cut
handles blades much bigger than my makita 5" bench one which i hardly use now with TC blades.It can handle 9 1/4 " blades. Spose there are stones for them (TC): I just haven't looked.THe makita handles a little set but i never needed to try ones with heaps of set for really sappy woods like pinus elliotii.
With that machine one would have to know the diameter & exact number of teeth And as Frank mentions the set?.
I worked as a tool grinder for 17 years and I ran very similar machines. Mine were perhaps a bit more modern. The blade looks to me to be hollow ground on the sides (tapered) thus not needing set. It more than likely is used for cutting copper or aluminum. Just my opinion.
LaVern
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8:38 source video:
https://www.youtube.com/watch?v=46oUhIw5lLc
Nothing like old thumper motors, machines and Lederhosen...and finally we now know how they got that limb trimmer down!! I knew there was a use for kids...Hooray!
those arefricking awesome!!!! I had a uncle that dided a few years ago of old age ,he worked in a big lumber/saw mill, he did all the saw sharpening till just before he retired and it was cheeper to stick new china blades on.
Silicon carbide [green wheels] usually grinds TC, but re-sharpening is more likely with diamond impregnated matrix. More expensive, but with a little care last a long, long time.Quote:
Originally Posted by ranald
That is where many in the been counting department have it wrong. especially those who cannot differentiate between bottom dollar cost versus longevity of service.
they simply believe that change out times remain the same for top of the line or bottom of the line where they fail is in not accounting for the frequency of having to change out the cheap stuff. or the reduced quality of product at the near end of life blades.
And no most times it is not worth re sharpening the cheap blades. the hardness is not there the coatings once worn off leave the blades to create higher friction and even warpege.
As I stated previously I ground tools for 17 years and in the first 4 years or so we were using what was called Semi-high speed steel blades. Thes blades did have a set put on them. How we did it was set the teeth before grinding giving a bit more than needed and for copper and aluminum we just ground them enough to clean them up straight across the top. On the blades that were needed to cross-cut wood the machine was set for half the number of teeth thus grinding every other tooth, and the wheel was either dropped or raised a certain amount to give the alternate bevel grind. After one side was done the blade would be indexed to start on a tooth of the other side. Most of the blades we ground were 12 to 14 inches in diameter.Quote:
Originally Posted by Frank S
Frank, all very true. The cheap blades have crap blanks and low grade (hardness and coarse TC grain) carbide teeth. They heat up, warp, dull quickly and are just a waste of time. No commercial enterprise would consider them. I operated a specialty plywood and panel business in Sydney for 13 years and did HEAPS of cut to size work on my Wadkin clone 12" table saw. I used Freud and CMT blades having them regularly sharpened. The attached video link shows how the diamond wheel only grinds the face of the tooth, as the sides are hollow ground. I would get maybe 15 sharpenings for a $130 blade. I still have about a dozen blades with little tiny teeth from all that grinding! I still use the same sharpening service, costs $20-24 per blade. Can't see why you would do it any other way...I guess casual users only have 1 blade...you must have at least 2 if not 3 of each cutting type to allow for 1 week turnaround ( I'm 140 km from Sydney). Freud (not the DIY Diablo range), CMT, Amana, Forrest are all high quality. If it costs $30 - 60, it's junk...think $80-150 and locate your local sharpening service by asking the local cabinetmaker. Once you cut with a REAL blade, you will never look back! Cheers guys
Jim
https://www.youtube.com/watch?v=1QT3G9r9SYw