3:51 am
May 13, 2010
Anyone use them? I have been cutting a lot of as forged/normalized 4140/4340. It is sometimes hard on blades, I am currently using MK Morse M42 bimetal blades paying about $50ea the carbide are around $200 but if hitting a slightly hard spot doesn't kill one side of the blade it could end up cheaper. But if they are really fussy and easily damaged or need a higher speed (saw is max 260sfm) it's probably not worth it.
5:13 am
March 18, 2010
Hey John! I'm pretty much in the same boat, thought about them a lot, never tried one. Then again I had employees who weren't as careful as they might be if they were paying for them. That being said, I used to sharpen lots of big demolition bits by sawing a new point or chisel on them. I got really good life out of M42 blades running about 100 SFP.
“There are painters who transform the sun into a yellow spot,
but then there are others who, with the help of their art and their intelligence,
transform a yellow spot into the sun.” ~ Pablo Picasso ~
7:45 pm
May 13, 2010
Well if I try one I will let you know. The blade that is on the saw right now that I thought was toast because it was sawing WAY out of square on some pipe, just cut 100 pcs. of 2" x5/8" flat bar and the cuts were square. I had them on edge because I was cutting 6 at a time. So the blades are lasting longer than I thought. The blade is way too coarse for the pipe (4 6 vari) I had the feed set really slow but I wonder if the coarsness of the blade was why it was cutting crooked.
Was that 100 sfp just for hard material or did you run it that slow for everything?
8:39 pm
March 18, 2010
I run about 150 on annealed alloy steel and 300 on mild. In fact, I was going through too many blades once on mild by going too slow. Things improved a lot when I kicked it up to 300. Higher speeds tend to cut straighter too.
I was having trouble with blades cutting crooked after a short time and recently found my idler wheel slide was so packed with rusty chips and gunk that it was preventing the blade from pulling up tight. Man! What a difference! Sure glad I had saved all those blades, they work great again. Need good guides and good tension.
I once had a guy cutting 3" diameter copper-nickel slugs for me. Nasty, gummy crap, it was, likes to take out teeth. Hard to find the right speed/feed. Well, he was cutting late one night and wiped out his last bi-metal blade. Ha had some el-cheapo carbon steel blades and figured he'd get a few more parts by using one. He cut parts all night! Now he won't use anything else for Cu-Ni!
My 30+ year old 18 X 18 automatic saw:
“There are painters who transform the sun into a yellow spot,
but then there are others who, with the help of their art and their intelligence,
transform a yellow spot into the sun.” ~ Pablo Picasso ~
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