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Need info for the purchase of a motor for an old craftsman scroll saw

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Forum topic by 1yeldud1 posted 09-30-2012 12:58 AM 776 views 0 times favorited 1 reply Add to Favorites Watch
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1yeldud1

298 posts in 1796 days


09-30-2012 12:58 AM

A dear friend gave me a 1950 model craftsman scroll saw. This old saw is in pretty good shape for its age. Due to the fact that it was given by a dear friend and co-worker i am in the process of getting it into running shape. I am in need of what size motor (HP and speed) and what the pulley diameters for the motor and saw should be. Any help or suggestions would be appreciated. should I consider using a “link” belt or a conventional belt system. Thank you for any replies.


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johnstoneb

820 posts in 927 days


#1 posted 09-30-2012 01:39 AM

I have an old Montgomery Ward scroll saw probably about the same age as your saw. My father-in-law gave it to me . He had put a 1/6 hp 1725rpm motor on it with 2 1/2 in pulleys. At 1725 SPM I could not keep a blade in it.
After messing with the blade holders and other thing. it finally hit me that it might just be to fast. I now have a 2 1/2” pulley on the motor and a 6” pulley on the saw that give me about 700spm. It holds a blade well and saws 1/4 in plywood very well.
To figure speed divide your drive pulley diameter by the driven pulley diameter and multiply that times the motor speed. On mine 2.5 divided by 6 = .416666 times 1725 = 718 SPM
A link belt might give you less vibration but a v belt would probably be quite a bit cheaper.

-- Bruce, Boise, ID

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