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One piece pulley

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Forum topic by Absinthe posted 11-08-2011 04:07 PM 927 views 0 times favorited 7 replies Add to Favorites Watch
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Absinthe

84 posts in 1999 days


11-08-2011 04:07 PM

I am wanting to make some pulleys. The smaller ones seem like I can make a mandrel and mount them in the drill press and hit them with a rasp to make the groove. However, I have a larger one that is about 10” and I fear for the stability if I try that with it. I have been contemplating other ways to make this groove all along the outside.

Any suggestions?

-- Absinthe


7 replies so far

View crank49's profile

crank49

3981 posts in 2438 days


#1 posted 11-08-2011 04:51 PM

I know you said one piece, but here’s how I would do it.
I’d make 2 disks with beveled edges. Could be done with a router or lathe or very carefully sanding on a disk sander or belt sander with a jig. Then once the edges are done glue the disks together forming the pulley groove between them. I would then pin the disks together with several large through dowells.

If you have ever been in an old plant or mill that had line shafts to power the equipment you might have seen lots of big wooden pulleys, but they were made out of segments and laminations, all running at different angles, and often pinned together. Admittedly, they were flat or slightly crowned instead of grooved, but the same principle would apply. My theory is that they were compensating for dimensional changes in the wood by making all the segments and laminations.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

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Absinthe

84 posts in 1999 days


#2 posted 11-08-2011 05:15 PM

Now that is a thought that I did not consider at all. However, I already have the circular blanks cut out. I am really wanting to cut a groove on them rather than making new ones.

-- Absinthe

View Bill White's profile

Bill White

4459 posts in 3428 days


#3 posted 11-08-2011 07:06 PM

Do ya have a lathe? Know anybody who does?
Bill

-- bill@magraphics.us

View Absinthe's profile

Absinthe

84 posts in 1999 days


#4 posted 11-08-2011 07:14 PM

I have a very small one, I don’t think I can do over 8” on it. But I will check.

-- Absinthe

View Don Johnson's profile

Don Johnson

652 posts in 2248 days


#5 posted 11-08-2011 07:24 PM

Would something like a flute cutting router bit do your job ?

http://magnate.net/index.cfm?event=showProductGroup&theID=114
or would the cost be prohibitive

-- Don, Somerset UK, http://www.donjohnson24.co.uk

View Absinthe's profile

Absinthe

84 posts in 1999 days


#6 posted 11-08-2011 09:49 PM

That could work. I was initially thinking of a cove or box core bit, but they would have to be handle vertically to the edge of the wheel. How would you work the bit vs the wood? Screw or clamp it down and just bearing guide it around? I guess any bearing guided bit would work, like a slotter or whatever…

-- Absinthe

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Absinthe

84 posts in 1999 days


#7 posted 11-10-2011 04:08 PM

OK, first one down! Coarse rat tail file and drill press with a bolt and lots of washers. That does it for the smaller of the two. It looks pretty darn good so far. The next one will have to be cut first to the right diameter, but I think I will try to do the same thing with it. I just hope it is stable enough to handle it.

-- Absinthe

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