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Spindles etc

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Philip Leith03/11/2011 16:32:13
15 forum posts
I have a startrite wood bandsaw with direct drive from a 3 phase 8 pole motor. I want to put on a single phase motor and will need to add a couple of pulleys to get the rpm down to 750 as at present. I obviosly need some kind of spindle to take the lower bandsaw wheel. I could make one, but are there any suggestions for something suitable which could be used?
Les Jones 103/11/2011 16:50:27
2292 forum posts
159 photos
Hi Philip,
Have you considered making a new longer shaft to fit the existing motor so that it extends out the back and mounting a pulley on the end of the shaft ?
 
Les.
Philip Leith03/11/2011 16:58:11
15 forum posts
Existing notor is flange fitted so would need to be moved away so that a spindle (of some sort) could be used in its place.
Philip Leith03/11/2011 17:04:21
15 forum posts
This is it here - http://www.daltonsmachines.com/uploads/images/osb/352SB-2.jpg

You can see the way the motor is set. Problem at present is it runs off an inverter but has no power and keeps stalling the inverter.

Edit - just noticed that picture is for a different version which has a spindle below the motor ... They must have given up using 8 pole motors at some point.

Edited By Philip Leith on 03/11/2011 17:18:36

Les Jones 103/11/2011 18:57:56
2292 forum posts
159 photos
Hi Philip,
I do not think I explained my idea clearly. The idea is to remove the armature from the motor and make a spindle to replace it but extended at the back of the motor so that a pulley could be fitted on the back . Looking at the picture I think the existing motor has a fan blade on the back. If this is the case then this could be removed an a pulley fitted in its place. If the inverter is cutting out under load then maybe it is not the correct rating for the motor. There are other people on this forum that have more knowledge than me on inverters so I expect one of them will reply.
 
Les.
Philip Leith03/11/2011 19:02:55
15 forum posts
Les
 
Ah, that was my original thought, but my question was whether I would be able to get a spindle off the shelf somewhere which would do, rather than make one.
 
Motor rating is correct for inverter. I will have a look at wiring again, though, in case I haven't got the star/delta thing properly sorted.
 
Philip

Clive Barker03/11/2011 19:44:35
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55 forum posts
29 photos
Hello Phillip,
 
Have you considered keeping the three-phase motor and drive but using a digital inverter? I recently purchased a shaping machine and was going down a similar route to that which you are proposing. In the end I kept the three-phase motor but fitted an inverter (as well as doing away with the no-volt release switch). I am very happy with the result. It is neat, gives a very smooth running variable speed drive which is quiet - and cost little more than purchasing a single phase motor and changing the pulley etc. If you wish to use a cheaper inverter (as I used) that supplies (3-phase @ 240v) you need to check that your existing motor can be wired in delta configuration.
 
Clive.
 
Sorry : Should have read later postings more carefully! - I see that you have been using an inverter. I guess you should check that it is correctly matched to the motor and the motor is correctly wired if is is supplying 240v.

Edited By Clive Barker on 03/11/2011 19:48:19

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