DoAll band saw questions

garcher · Jul 22, 2017

Hi everyone, i just purchased a DoAll 2013-20 Serial # 377-80563. Saw has been collecting dust for 10 yrs.2 HP DC motor.Line voltage is 460v 3 phase.I switched jumper wires for 230v as i have a 10hp rotary phase converter. I connected power, but when start button is pushed air pump will run but not dc motor and contacts will not stay closed without holding start button.There is a circut board in the panal with a small red light that will not come on.I am not familiar with these saws.any help and info would be greatly appreciated.

Thanks,
Glenn

specfab · Jul 22, 2017

I may well be wrong, but I think the only method for running a DC motor on AC is with a single-phase supply. And I'm not certain if this even works very well.

johnoder · Jul 22, 2017

They did come with DC drives. Could be bad - a reason for it sitting unused. Before you decide its kaput, you could undo what you did and try it with a three phase transformer feeding it 460. 5 or 6 KVA should do - at least for the saw motor

http://www.lislesurplus.com/2/20-doall-vertical-band-saw-dc-drive/

garcher · Jul 22, 2017

Thanks John for the reply,I will try that and do some further checking.Mine is identical to the one shown. Are these good saws?

Thanks
Glenn

garcher · Jul 23, 2017

Anyone with DoALL saw expertise they would like to share? Are they top of the line saws?Are parts readily available.Where can I find an electrical schematic?

Thanks
Glenn

kensmachine · Jul 23, 2017

for parts go to Doall

Wild West · Jul 23, 2017

If it were me I would investigate what it would require to but a single phase AC motor in it. At least a 3ph AC motor.

Steve in SoCal · Jul 23, 2017

DoAll saws are top line saws. The DC drive most likely doesn't like the RPC. Three phase DC power supplies are generally robust, that said, have the drive checked if practical. Checked could be as simple as power up the saw on true 480 three phase. DoAll has very good support and documentation for most of their machines, not cheap however.

Steve

Ohio Mike · Jul 23, 2017

garcher said:
Hi everyone, i just purchased a DoAll 2013-20 Serial # 377-80563. Saw has been collecting dust for 10 yrs.2 HP DC motor.Line voltage is 460v 3 phase.I switched jumper wires for 230v as i have a 10hp rotary phase converter. I connected power, but when start button is pushed air pump will run but not dc motor and contacts will not stay closed without holding start button.There is a circut board in the panal with a small red light that will not come on.I am not familiar with these saws.any help and info would be greatly appreciated.

Thanks,
Glenn

I would assume the starter has a 460v coil and won't stay closed. Probably also has 460v heaters (or proper sized overload relay). Dropping from 460 to 230 would double the amp draw. DoAll saws are awesome. Last I checked DoAll supplied all manuals online you just need to find the page with the search function. DoAll has been making saws for over 70 years so there have been more than a few models and revisions over the years.

DocsMachine · Jul 23, 2017

Wild West said:
If it were me I would investigate what it would require to but a single phase AC motor in it. At least a 3ph AC motor.

-I believe the DC saws are direct-drive, or nearly so. They don't have the variable-sheave drive of the standard DoAlls.

Doc.

bsg · Jul 23, 2017

DocsMachine said:
-I believe the DC saws are direct-drive, or nearly so. They don't have the variable-sheave drive of the standard DoAlls.

Doc.

That's correct......also the D.C. Part of the saw is single phase.

Kevin

johnoder · Jul 23, 2017

bsg said:
That's correct......also the D.C. Part of the saw is single phase.

Kevin

How odd - so is the blade welder. Wonder why the saw lives on three phase supply

Steve in SoCal · Jul 23, 2017

johnoder said:
How odd - so is the blade welder. Wonder why the saw lives on three phase supply

Could be like the later Monarch 10EE's the coolant pump was the only 3 phase load. I knew that some DoAll saws had DC drives, I assumed they were three phase.

Steve

metalmagpie · Jul 23, 2017

My first guess would be that you have the wild leg hooked up to your control electronics. My Nardini lathe wouldn't run for anything until I figured out which was the leg generated by my RPC and connected the other two to run the motor controls.

metalmagpie

bsg · Jul 24, 2017

Steve in SoCal said:
Could be like the later Monarch 10EE's the coolant pump was the only 3 phase load. I knew that some DoAll saws had DC drives, I assumed they were three phase.

Steve

On my saw the only thing three phase, the motor for the hydraulic pump for the table feed......

Kevin

garcher · Jul 25, 2017

Thanks everyone for your replies.I will do some checking this weekend and I will keep you posted.

Thanks again
Glenn

garcher · Jul 26, 2017

Update on bandsaw. Today I did some checking and came up with the following. This saw uses 3 phase power for the air pump only.Blade welder is 240v single phase.I blew out dust on circuit board and cleaned contact surface of 2 small fuses.I can manually push motor contacts and saw will run but I don't think motor is running full speed.Contacts also have a moderate humm.Could it be dirty main contacts and bad auxiliary contacts?Also I swapped incoming line wires as I had wild leg on control circuit. Thanks to all the input from the professionals here am now making progress.

Thanks
Glenn

split tenth · Jul 26, 2017

Great machine. Once again I was taught how to set up and saw accurately by the "old heads".We had to saw file to within .010 to .015 from a scribed line.We were not given many end mills so we milled off minimal amounts of steel.Thank you "old heads"you taught me well.We used copper sulfate for the lay out medium and a Vernier layout gage.

garcher · Aug 3, 2017

Update on bandsaw. Talked to an electrician friend at work and and he told me to bypass 480/240 transformer.Since I was feeding it with a 240V RPC the transformer was reducing it to 120V. Contactor has a 240V coil.Saw runs perfect . Thanks for all the replies and help. I will post pics when I get it cleaned
up .

Thanks again
Glenn

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