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Post by accidentalrockhound on Jan 1, 2018 12:21:09 GMT -5
Finally breaking in my 10" MK303 blade running it on my HP B-12 combo unit. Cut a few small rocks. Cuts went well had to hand feed them and i used baby oil as coolant. #1  #2  #3  #4 A group shot.  |
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Post by Bluesky78987 on Jan 2, 2018 11:38:52 GMT -5
Looks like it's working great! Love the orange/red/white slabs. What material is that?
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Post by rockjunquie on Jan 2, 2018 12:49:08 GMT -5
Yya! Love that brecccia.
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Post by accidentalrockhound on Jan 2, 2018 18:16:06 GMT -5
Looks like it's working great! Love the orange/red/white slabs. What material is that? Thanks. I think it maybe old stock wingate pass. I could be wrong i have alot of material i am trying to figure out. |
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Post by youp50 on Jan 2, 2018 18:50:49 GMT -5
I recall my blade was marked for the rotational direction. There is a 50:50 chance it is rolling the right way. I lost the direction during the first clean out. Now I mark it prior to a clean out.
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Post by Bluesky78987 on Jan 2, 2018 20:29:49 GMT -5
Looks like it's working great! Love the orange/red/white slabs. What material is that? Thanks. I think it maybe old stock wingate pass. I could be wrong i have alot of material i am trying to figure out. Oh, that horrible old stuff. Not worth cutting. Practically hazardous waste. Just send it to me, I'll dispose of it. ;-) |
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Post by pauls on Jan 2, 2018 22:26:52 GMT -5
Thats a great blade, I bought one in 1965, it cost the equivalent of 2 weeks wages for my Dad. It lasted until very recently.
I'm not sure about the direction thing, I was always told to reverse your blade occasionaly to stop it becoming dished, it always cut a bit better for a while after being turned around.
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Post by johnjsgems on Jan 3, 2018 15:06:05 GMT -5
There will be a sometimes hard to see arrow stamped in core. Almost always on side opposite the arrow. If the person puts the label on the right side facing the label the blade turns counter clockwise. One year with the old labels that had an arrow included I found 3 or 4 blades with label on wrong side. All the MK/BD sintered blades have the diamonds oriented to cut in one direction. The old notched rim blades were non directional and reversing could help to clean off glazing over of surface. Best to just use a dressing stick, old silicon carbide wheel, or fire brick with these.
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Post by Lapidaryrough / Jack Cole on Jan 3, 2018 16:21:36 GMT -5
i see your not using the brass rod under the vise. The rod holds the vise true Sq. to the blade.
best replacement is welding brass rod. i have the E-10 highland-park cab unit, its a 1955.
the rod was worn flat. keeps the vise out of loose rock chips on deck of drain pan.
And less ware on blade, from vise walking back forth.
Speed feed on trim saws for any thing thicker then 1/2" 8-10 minutes to the inch.
I find the notch blades (301) or (297 ) last longer.
Jack
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Post by johnjsgems on Jan 3, 2018 17:40:34 GMT -5
If you have a source for 301 notched rims I would be interested. They stopped making them in 2007 I think. I bought all the large blades they had left and a bunch of oddball labeled smaller sizes but foolishly sold them all really cheap at Buena Vista.
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Post by Lapidaryrough / Jack Cole on Jan 4, 2018 11:23:47 GMT -5
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Post by johnjsgems on Jan 5, 2018 11:41:57 GMT -5
Those are the current 301 blades. The old 301 notched rims (and 297 notched rims) were mild steel cores with notches in core edge, diamond mixture brushed on over notches, notches machine rolled over and mixture sintered into core in high temp electric furnace. Something like a 22 step process with 4 American workers doing a lot of hand labor. 301 blades were generally painted red and the 297 blades black. They asked me what color I wanted sometimes as the blades sat unpainted until ordered as different companies could buy blades in their color (like Lortone blue, Covington green, etc. The 297 blades had slightly less diamond content. The cores had to be mild steel to permit the notching and were prone to losing temper if overheated. When they still had the furnace they could retemper blades really cheap for people but the old furnace is now somewhere in Mexico. The current 301 (and 303) blades use a high carbon steel core that is much stronger than the old mild steel cores.
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