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DIY PVC Sander Drum Length?

#257178 by fersidhe » Mon Feb 18, 2019 8:00 pm

I have some 3" schedule 40 PVC that came with my garage when I bought my house. Wall thickness is .24". I'm using laminated plywood end caps that I turned on the lathe for a press fit. I was planning on making the drums 24" wide but I've been wondering if that's an acceptable length with the PVC drum being hollow? Looking to avoid vibration, etc. Thanks in advance.

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Re: DIY PVC Sander Drum Length?

#257186 by JPG » Mon Feb 18, 2019 10:30 pm

Fill it with plaster of paris?

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╟JPG ╢
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Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E(SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange

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Re: DIY PVC Sander Drum Length?

#257188 by Hobbyman2 » Tue Feb 19, 2019 12:03 am

Use hook and loop paper ,24" worked out for me JMO, I end up with a good 18-20 " work area Also keep in mind the pvc is not perfectly round . jmo

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Hobbyman2 Favorite Quote: "If a man does his best, what else is there?"
- General George S. Patton (1885-1945)

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Re: DIY PVC Sander Drum Length?

#257190 by rpd » Tue Feb 19, 2019 12:17 am

Could you make some more rings like the end caps, but slip fit to support the center.

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Ron Dyck
==================================================================
10ER #23430, 10ER #84609, 10ER #94987,two SS A-34 jigsaws for 10ER.
1959 Mark 5 #356595 Greenie, SS Magna Jointer, SS planer, SS bandsaw, SS scroll saw (gray), DC3300,

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Re: DIY PVC Sander Drum Length?

#257204 by fersidhe » Tue Feb 19, 2019 12:28 pm

So I gather I want to fill the drum with weight? I can load it up the PVC pipe with MDF circles, but I think I'd need a shaft to go all the way through? I just was hoping not to spend anything. Can I glue a dowel through the middle of all them instead of a threaded/metal shaft since they're there just for mass? I'm planning to drive the drum with the pic attached and the tailstock side will have a slight friction slip fit over a live tailstock bearing.

Velcro is on my to-do list on this at a later date.

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Re: DIY PVC Sander Drum Length?

#257206 by reible » Tue Feb 19, 2019 1:13 pm

I did a pretty extensive post on a project to make a sandfree type sander that used PVC as a drum. I found I had to turn the PVC to get a nice uniform round surface and yes I used a shaft the went the full length and used pillow block bearings.

Others have seemed to get away with just using store bought PVC??? Anyway you might pick-up a few things from reading this thread:

beginning-woodworking-f6/basic-or-not-so-general-interest--t5342.html

Ed

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{Knight of the Shopsmith} [Hero's don't wear capes, they wear dog tags]

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Re: DIY PVC Sander Drum Length?

#257216 by rpd » Tue Feb 19, 2019 6:13 pm

I think it would be easier to keep the two ends straight and concentric with a shaft that went all the way through. :) I don't think weight is a concern, I was only suggesting a few extra rings, spaced apart, to keep the center, length wise, concentric with the shaft through the center. If you are building it like a sand flee or V-drum sander there isn't any pressure against the drum, Not sure about a thickness sander, I have no experience with one of those.

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Ron Dyck
==================================================================
10ER #23430, 10ER #84609, 10ER #94987,two SS A-34 jigsaws for 10ER.
1959 Mark 5 #356595 Greenie, SS Magna Jointer, SS planer, SS bandsaw, SS scroll saw (gray), DC3300,

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Re: DIY PVC Sander Drum Length?

#257217 by JPG » Tue Feb 19, 2019 6:18 pm

The purpose of filling the center is not to gain weight, but rather to gain rigidity. Any non compressible substance will do. Cement grout comes to mind as well.

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╟JPG ╢
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Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E(SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange

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Re: DIY PVC Sander Drum Length?

#257254 by fersidhe » Wed Feb 20, 2019 7:41 pm

JPG wrote:The purpose of filling the center is not to gain weight, but rather to gain rigidity. Any non compressible substance will do. Cement grout comes to mind as well.


That’s a great idea, I have 2 five foot length’s of 3” pvc pipe. I wonder how a can of expanding foam would work on a 20” section? I know it’s foam, so it’s compressible, but it gets pretty stiff and stable, it may be light but still provide enough rigidity?

Anyone have thoughts before I go hit the hardware store? (Which I was trying to avoid, but I have a real zeal for simple inexpensive solutions over time consuming complicated ones.)

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Re: DIY PVC Sander Drum Length?

#257255 by JPG » Wed Feb 20, 2019 9:56 pm

Lack of 'compressibility' is the desired attribute.

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╔═══╗
╟JPG ╢
╚═══╝

Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E(SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange

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