I have a Hitachi B600 (the ancestor of the CB75) and the underpowered universal motor is about to go up in smoke. It’s a 15 amp 120 V motor, I make that to be about 1 t0 1 1/2 HP. I’d like to put on a 2 or 3 HP 240 V motor. I have two questions that some of the experienced folks can answer:
What speed should the blade go. A recent 18″ bandsaw test gave speeds of 3,000 to 4,000 feet per minute for the blades which is faster than I understood that wood blades go.
What type of motor do I need? I see “compressor duty” motors, “farm duty”, and others. I’d like to get a TEFC motor, but not pay $600!!
Replies
Telemiketoo;
Stick with TEFC to keep out dust. Recently repowered a 3 phase jointer with single phase purchased from, http://www.electricmotorwarehouse.com price was very reasonable. Good luck.
Jim
Like jim said, you want a TEFC motor, but no "special" duty is required. Any single-phase motor of that size will be capacitor-start. But the bigger problem you will have is adapting the new motor to the saw frame. The original motor was a gear motor, and likely has a unique mounting method. You also need to adapt the drive sheave to the motor shaft. The new motor will have a standard 5/8 or 7/8 diameter shaft, depending on frame size, but the sheave bore may not be the same. Reduction ratio may also be an issue.
None of this is insurmountable, but do be aware of probable difficulties. 3000 to 4000 fpm sounds pretty standard to me. Delta's 20" BS runs 4750 fpm.
Be seeing you...
My 40 yr old Sears 12" BS has a 1 hp, 3450 rpm, capacitor start, open motor on it. I have to give it a blast of air about once a month to blow the dust out of the centrifigual switch. Been using it daily for several years (15+). I do have it hooked to a 1200 cfm DC, but a little residual dust still escapes.
PlaneWood by Mike_in_Katy (maker of fine sawdust!)PlaneWood
what size blade do you run on it? I don't know how close in relation your saw is to the CB75 (aside from carrying the same underpowered characteristic) but the CB runs that 3" blade at only 900fpm, I'd be concerned about issues related to doubling or tripling the blade speed.
TEFC is the right way to go on machinery like this. How does the motor mount on your bs?
Thanks Jeff. I don't know where I heard it, but 3,000 did not seem right - I thought originally about 800 fpm. The saw was a rusted orphan when I bought it from a bay area hippy retailer with a leaky roof and it had no documentation.The B600 is the direct ancestor of the CB75. The big difference is that the B600 has a really lightweight guide assembly on the bottom without a bearing. I may figure out how to put a better guide and bearing assembly on someday. I run the all stelite 3" 2 tpi blade, mostly for resawing and cutting blocks of log into boards and billets.
with that 3" blade I would suspect that you would have a major heat problem if you run it faster than 1,000 fpm. Of course, you could still run a modern 3hp TEFC motor and custom size the pulleys to dial in the speed, but I would be willing to wager that it's probably already close to spec with what you have.
If you have access to a machine shop, or are willing pay someone to do it for you, you could probably custom mount a 3hp motor out of a tablesaw and make it work. The Unisaw replacement motors are only about $300. At any rate, the CB75F is a $2,500 machine, so investing a few hundred for parts could still put you out well ahead. But again, I don't know how the motor mounts onto this machine, so it could be even easier.
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