Vintage Craftsman motor Rpms

[powerpuff]

I have a 1970's era Craftsman belt disk sander combo and i have been searching high and low for a era correct motor. The college i work at has a tiny work (6x9)shop in the basement of the Enviromental Science building, that a retired professor used to build displays,cabinets ect. This room has flooding issues and all the tools might go to the dumpster or surplus according to old Professors replacement. On the bench in this mess, is a 1970s Craftsman motor 1hp but it runs at 3750 according to the tag. Is 3750 too fast for a sander? How about the the 1 hp? Too much? This motor is pretty much free so it is tempting. Thanks

 

[Capt. Spaulding]

I cannot help you with your question, but if it’s free then I suggest taking it. If you can’t use it for what you need you may find another use for it.

I found a old Craftsman motor at a garage sale for $5. I sure didn’t need it but couldn’t pass it up as it may be used in the future or make a nice display piece.

 

[lilredex]

3750 RPM is probably not ideal for a belt driven sander, but if you have the room you could bring the sander speed down with pulleys sized right. The HP shouldn't be a concern. Got any pictures??

 

[Maui]

I just resurrected one of these vintage Craftsman 6x48 sanders, and initially used a 3450 rpm motor on it. The belt was turning at about 2100 rpm, and I ended up burning the wood at that speed. It was WAY too fast. I swapped out that motor for a 1725 rpm motor and changed the pulleys so that the belt spins at about 1400 rpm now. That’s about perfect. With a brand new 80 grit belt it works beautifully.

Maui

 

[powerpuff]

well it sounds like my search will continue. I am really not sure what the professor was using this motor for since all the equiptment seems to be early nineties Grizzly stuff but the water intrusion also could have damaged this motor or it just does not work hence the reason for it being on the bench...

 

[larry_g]

I have a 1970's era Craftsman belt disk sander combo and i have been searching high and low for a era correct motor. The college i work at has a tiny work (6x9)shop in the basement of the Enviromental Science building, that a retired professor used to build displays,cabinets ect. This room has flooding issues and all the tools might go to the dumpster or surplus according to old Professors replacement. On the bench in this mess, is a 1970s Craftsman motor 1hp but it runs at 3750 according to the tag. Is 3750 too fast for a sander? How about the the 1 hp? Too much? This motor is pretty much free so it is tempting. Thanks

What you need to do is research abrasive belt speed. Here is one place to start, https://www.burrking.com/news/artic...y-combination-sanders-dont-spark-our-interest and go from there. Belt speed in feet per minute (FPM) is what dictates most of what you have to do. Personally I think it is hard to put to big of a motor on a belt sander/grinder. Do your homework on your belt materials, and the materials you will be working with. Are you working with wood or metal mostly?

lg
no neat sig line

 

[454ragtop]

Note this is most likely a 3450 RPM motor, not 3750, not a std motor speed as far as I know. If free, and you see other machines in your future, you'd be crazy not to grab it. Good motor for a lot of wood working machines, could also be used as trade bait.

 

[powerpuff]

Mostly Wood. i will read up on this, thanks. I found this sander at a yard sale for free, the old man who gave it to me, had a bearing go out and had no luck finding one. I found some on Sears.com and installed them. The Old Man wanted to sell me the motor that went with this sander but being a idiot i passed. He only wanted a dollar fifty......

 

[larry_g]

http://www.jettools.com/us/en/c/met...-sanders-and-grinders/300?filter=1&reset=true

http://content.jettools.com/assets/whitepapers/708596K_WP_EN.pdf

The first link gives you the chance to select different metal grinders by SFM

The second link is to a random grizzly for wood that shows it runs at 2200 SFM, which may be comparable to your sander.

lg
no neat sig line