Doall 16-SPF

Tradesman300 · Mar 29, 2017

Hello. I have purchased a Doall saw circa 1955. This was rescued from the facilities division of the Seattle public schools. The variable drive assembly is wrecked. I have come up with a shoestring way to try to resuscitate this assembly, but with reduced functionality. Does anyone have info on a modern day replacement, or (PLEASE) perhaps a repair part that would get me going?

Saw is a 16-SFP

kazlx · Mar 29, 2017

Can always just run it with normal pulleys and a VFD on the motor to control speed.

plastikosmd · Mar 29, 2017

I converted mine to run on vfd. I listed my drive parts in the classifieds about 2 weeks ago. I know eBay also had some parts when I listed mine. Shoot me a pm if you want

Tradesman300 · Mar 29, 2017

kazlx said:
Can always just run it with normal pulleys and a VFD on the motor to control speed.

Do you have pictures of this conversion? a VFD was on my original list, but I wanted to somehow preserve the cool mechanical nature of this saw.

kazlx · Mar 29, 2017

No, it should be pretty self explanatory. The blade needs to turn with a certain SFM to be useful. The motor is probably 1700 rpm or so. Figure out how to get in the ball park from point A to point B. Add a VFD and you have some control over the motor while it's running. It's just ratios. Mechanical system does the same thing, but if it's busted, you can either fix it or remove it. Not many other options.

Tradesman300 · Mar 29, 2017

The reason I ask is because in my assessment this is not as straight forward as just adding in a fixed pulley.

The existing motor is not rated for inverter duty and I have read over and over again how they burn up in VFD applications, plus there is a misalignment factor that would need to be addressed either way (new motor and pulleys, everything running in new planes, etc).

So for me (total amateur) seeing pictures is literally worth a thousand words.

kazlx · Mar 30, 2017

Tradesman300 said:
The reason I ask is because in my assessment this is not as straight forward as just adding in a fixed pulley.

The existing motor is not rated for inverter duty and I have read over and over again how they burn up in VFD applications, plus there is a misalignment factor that would need to be addressed either way (new motor and pulleys, everything running in new planes, etc).

So for me (total amateur) seeing pictures is literally worth a thousand words.

Well then, the project may not be for you. The chances of you finding a detailed explanation of everything are slim to none. You don't really have any options. Fix the drive that's in there, which may require getting lucky on finding parts, or replace everything.

Just go for it. Who cares if you burn the motor out. It already doesn't work, what have you got to lose. If you get it all working and the motor burns out in a year, then buy another motor.

johnoder · Mar 30, 2017

Might be worth looking through

http://www.practicalmachinist.com/vb/general/rebuilding-do-all-band-saw-180234/?highlight=DoAll

http://www.practicalmachinist.com/v...w-drive-bearing-repair-85144/?highlight=DoAll

plastikosmd · Mar 30, 2017

I posted my conversion on vdf area of this site. No machinging needed just a longer belt and flipping or changing of the motor brackets. Doozer went a different route in his post and kept the factory belt and made a new motor support. My way took about 20 min to change. Took longer to connect the wires and mount the vfd box

Pete Deal · Mar 30, 2017

I am not familiar with the doall but the pictures remind me of my Rockwell 20" which had a similar variable pitch pulley system that was about the same condition when I got the saw. In my opinion the vfd has made these obsolete and I don't miss them one bit. Convert to VFD and you will not regret it.

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