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The North Carolina Custom Knifemakers Guild Forum The North Carolina Custom Knifemakers Guild. Raising the general awareness of custom knives and the people who make them. |
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#1
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disk grinder
I have been bugging Steve Randall about abrasives, more recently for disk grinders, and want to broaden out with more questions to you guys. I have a 1hp motor with a 1/2" spindle, and want to add a teco vfd and a beveled disk. Is there a way I can beef up the 1/2" spindle to 5/8"? Is a "sleeve" appropriate? And safe? Otherwise I'll have to have my machinist make a disk with a 1/2" hole. Looking forward to any/all responses.
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#2
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If you make a 5/8 sleeve I'd split it so the screw in the disc will clamp the shaft.But after I went back and read what I posted the sleeve would be pretty thin. May be better if your disc had a 1/2 whole .
I need to call steve and bug him again about SuperGrit. don't want to buy something that will not work. |
#3
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A VFD requires a 3 phase motor. Is your motor 3 phase? Look up Wayne Coe he has a good list of motors and vfd's on his web site.
__________________ Barry Clodfelter Proud member of PETA....People Eating Tasty Animals There is a place for all of God's creatures...right next to the mashed potatoes and gravy! |
#4
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No Barry, it's a single phase, one HP, 3450 rpm swimming pool filter pump. Is there a way to put some type of rheostat or something on it?
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#5
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There probably is a way but you will more than likely loose torque when you slow it down.
__________________ Barry Clodfelter Proud member of PETA....People Eating Tasty Animals There is a place for all of God's creatures...right next to the mashed potatoes and gravy! |
#6
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Quote:
I would opt for a 1750 RPM motor over the 3450. I've been using a disk grinder on my blades for 20 years. Always had single speed and 1750 RPMs. I still have to be careful when grinding heat treated blades. There is a way to rig a treadmill motor and controls. Most are 2HP and definitely adjustable speed. Phillip and I have one but we have yet to set it up. __________________ Barry Jones Knives |
#7
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I think we need a seminar on converting stuff into usable equipment! I have a 1725 also, and an old potters wheel head that needs to be machined to 8 7/8 with a receiver for the shaft. I like the idea of the treadmill motor and speed control. Gonna keep my eyes open. maybe I can take the 1450 and figure out a way to make a surface grinder out of it.....
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#8
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Would it be bad to mount the disk on a bearing and pillow block and drive it with a belt instead of direct drive off the motor. That way you could use variable size pully's to adj. speed.
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#9
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Andy, I was thinking about that yesterday. I'm just trying to figure out a way to slow down a flat grinder so I can make the kind of knives I see in my head. I was hoping that using an old retrofitted potters wheel would do the trick, but 250 rpm isn't quite sufficient. $800.00 for a motor, vfd and disk is beyond me right now, although I do really like what Wayne Coe puts together. Thanks for all the help!
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bearing, grinding, knives, mount, randall |
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