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does a drum idler really need to be crowned

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Forum topic by joez posted 08-08-2011 05:19 PM 1364 views 0 times favorited 7 replies Add to Favorites Watch
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joez

120 posts in 2369 days


08-08-2011 05:19 PM

Topic tags/keywords: homemade bench sander

Does a drum idler really need to have a crowned in order to track the sanding belt right?


7 replies so far

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David Kirtley

1286 posts in 2464 days


#1 posted 08-08-2011 05:48 PM

Unless you have some other way to lock it on track such as guides.

-- Woodworking shouldn't cost a fortune: http://lowbudgetwoodworker.blogspot.com/

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Bertha

13003 posts in 2159 days


#2 posted 08-08-2011 05:50 PM

My guess would be “yes” but I’ve never built one. I had some crown-less tires on an old bandsaw and it’d throw blades off like a hillbilly tosses Burger King wrappers.

-- My dad and I built a 65 chev pick up.I killed trannys in that thing for some reason-Hog

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crank49

3981 posts in 2437 days


#3 posted 08-08-2011 05:56 PM

If you mean the pulleys at the ends of the conveyor, they are called the head pulley and the tail pulley. The head pulley is most often the one that is driven by a power source and is usually at the discharge end of the conveyor. The tail pulley is normally not driven and is at the input end of the belt. The tail pulley is usually the one that is crowned. It is also usually mounted in such a way that its axis can be adjusted to control tracking. This is done by mounting the bearings in adjustacle sliding supports; these are commonly called “take-up” bearings. The crown of the pulley will help make the belt run to the center of the pulley. I reduces the sensitivity of the alignment adjustments. But, crowning is not absolutely required. Without it, however, you better have easy access to the tracking adjustments because adjustments will probably be needed often.

Idler pulleys are ones in between the head and tail and only serve to support the load. There are some special idlers used on very long belt conveyors called tracking idlers that can center the belt automatically.

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

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joez

120 posts in 2369 days


#4 posted 08-09-2011 04:09 AM

bench/ belt sander not conveyer

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crank49

3981 posts in 2437 days


#5 posted 08-10-2011 03:53 AM

I thought you said “drum sander” in which case I assumed you were referring to the belt that pulls the wood past the sanding drum.
Belt sander / belt conveyor; same difference. Principle is the same and the parts have the same names. In fact, the conveyor belt on drum sanders is often a large sanding belt used as a conveyor.

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

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joez

120 posts in 2369 days


#6 posted 08-13-2011 12:09 AM

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joez

120 posts in 2369 days


#7 posted 08-14-2011 12:14 AM

thanks for the vids, I remember those vids just forgot where.

cr1

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