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Motor for drill press

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woodbrains

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Hello,

I have a nice Elliott Progress drill press and need a single phase motor to suit. There are lots of mouth watering machine restorations here, so I thought there might also be a wealth of knowledge as to where to get a good motor. It needs to be foot mounted, 4 pole, 1/2 horse with a 5/8 in shaft 2 in long. Tried the dreaded ebay and cannot find a used example to suit. There is one new one that will fit, but a bit pricey. I will stump up for it, as the drill is worth it, but would like to try other options, before I do.

Cheers,

Mike.
 

9fingers

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Elliott progress are excellent drills especially if you have a geared head model - I am envious if you have!

Your main cost driver will be sticking out for a 5/8" shaft rather than a modern metric motor.

I can understand if you don't want to re -bore the pulley but that is the cost trade off compared to cheaper motors.

I have been involved with the fitting of several motors supplied by an excellent ebay vendor*

"electric motor man" Each of his adverts have contact details on there and he can get almost any motor for you and I've always found his prices fair.

I'm sure he will sort out a solution

HTH

Bob

* there may be other motor vendors!
 

fluffflinger

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Another one for you to try would be themole12 (you'll find him on ebay). I brought my Fobco Star from him last year. He specialises in equipment for model engineers but his lock up is stacked with all sorts and he is a really, really decent guy, only sorry I can't remember his name. The drill I purchased was three phase and he sold me a single phase motor for an additional fee of £30.

Sure an email via ebay would set up a dialogue.
 

9fingers

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If the problem is that you have a working 3 phase motor on the drill at the moment, I can possibly help you to run that from a single phase supply and as a result, get variable speed operation thrown in. The cost of doing this will be less than a new 5/8" shaft motor.

Bob
 

woodbrains

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Hello,

No need for envy, my drill is only a No1 floor stander. The smallest one they made, (excepting bench mount version of the same) but still built to survive nuclear blast.

The drill is fitted with a 3 phase motor, and I was considering an inverter to run off 240 single phase, but am not confident I would have got the right kit. If I remember correctly, it is a dual voltage motor, so should be wirable for delta and star. Then I heard that there might be problems with interferance when using an inverter so did not want to get involved with supressors when I wasn't to sure about the outcome.

If you could give some guidance in this area, then i would be willing to give it a go. I would be very grateful for your expertise.

The electric motor man was someone I was looking at on ebay a while ago, but seems sadly absent at present.

Cheers,

Mike.
 

paulm

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Try Tony at Goldcrest Technologies on ebay for motors, sourced an uprated one from him for my bandsaw a few years ago, very knowledgable and helpful and the motor was very reasonably priced and entirely reliable to date.

Cheers, Paul
 

beech1948

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woodbrains,

An inverter is the way to go and has a number of advantages. eg
1) Fairly low cost and probably cheaper than a new 5/8th shaft motor
2) Variable speed
3) Intelligent slow start up and shut down
4) Simple to do and help is available from here
5) A 1/2 horse power motor will mean you can use a lower cost inverter
6) Keep your Progress as a 3ph machine

Your worry about suppression seems to be a little overdone. I would expect a well known brand to be properly suppressed and to cause you no problem. Suppression worries are an old myth.

It is within your ability to add this inverter to yourt shop.

Al
 

woodbrains

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Thanks for all the useful advice, everyone. I think I should keep the original motor, then and get an inverter. Bob has kindly PM'd me with some info and I think I will take him up on his help. Just one final thing, I checked the motor plate today and it is in fact rated for two voltages. It is labeled as star and mesh, though. I assume mesh is a term for delta. Also the wiring box contains 4 teminals A,B,C and N) rather than the 6 I was expecting. Would this be a problem?

Mike.
 

9fingers

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Yes Mesh is another name for delta - I'm not aware of the origins of the term Mesh in this context.

If you look at the wires coming from inside the motor, I would expect to see one wire going to each of the terminals A, B & C and three going to the N terminal. You may or may not have to look behind the paxolin plate to see these.

to convert to delta, separate the three wires from the N terminal and each of these should have an electrical connect to A, B and C but not to each other. Think of these as A' B' and C'

connect A' onto the B terminal, B' onto C and finally C' onto A. leave N with no wires on it.

The motor is now wired for the lower voltage on the plate.

Have a look at my motor paper here http://homepage.ntlworld.com/bob.minchi ... Issue2.pdf

figure 8 should illustrate the conversion you will have made.

hth

Bob
 
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