Gallery, Projects and General > How to's

Making a Sub Spindle

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sbwhart:
Thanks for that John

I was looking for a slightly bigger motor but all I can seem to find is 1/3 HP ish with around 1800 rpm the sewing machine motor is the best I could find, but I'll keep looking, if I find something better, the sewing machine motor will be useful for something, I may even take up sewing.

Cheers

Stew

Maninshed:
If you are using your spindle as a tool post grinder, a thing to be careful with is the bearing preload, I assume you will be using angular contact bearings, as these are better for this type of work they take the axial and end loads better. I built the quorn cutter grinder type spindle, looks very similar to your sketch, but it has a bearing preload system using springs giving about 10lb preload on the bearings. I would think  the book you have will make some referance to preloading bearings.

Martyn

arnoldb:
Stew, very interesting.  I'll be closely following this one  :borg:

Cheers, Arnold

sbwhart:
Martyn

I'm going to use ball bearings. Like you I thought taper bearings would be better, from the book the author discuses the use of the Quorn spindle that he thinks is excellent: however, it is best in one direction due to the pre load which is fine for the Quorn, but his spindle could be used in either direction, the author does admit that his solution is not ideal but its simple design makes it easy to manufacture and will allow the bearings to be replaced if undue wear accures.

In his design of what he calls his basic spindle that can be used for milling he uses three bearing a plane bearing at the back and at the front he uses a pair of radial and axial load bearings back to back to take the loads. (I think these are similar to wheel bearing in a car but i'll stand to be corrected on this)

I have looked at the Quorn with a view to making one how have you found it ?, would it be possible to post a few pics so the chaps have an idea what they look like. 

Cheers
 :beer:
Stew

NickG:
Stew,

I would have thought taper roller bearings would be ok to deal with axial and radial load. But maybe ball or roller bearings along with thrust bearings would be better still.

I thought car wheel bearings were taper roller ... not sure ... I know mine need doing though!

Nick

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