Tommy
Administrator
Member since January 2013
Posts: 12,683
|
Post by Tommy on Dec 14, 2013 11:45:28 GMT -5
I'm using a home made 8-wheel cabber with 8" nova wheels on a 1.00" shaft obviously. I'm currently using 1" ID white PVC pipe as my spacers which works fine but I'm looking for ideas on fine-tuning it and reducing the vibration slightly. It doesn't vibrate a lot but just enough to be annoying on the outter-most wheels.
I'm cutting the PVC on my chop saw currently because I don't have a pipe cutter capable of cutting 1" pipe. It's fine when I cut lengths of 1" or more but now my desire is to reduce the spacers down to about 5/8" and move all the wheels closer together and closer to the center. Seems like when I cut (thin less than 1" long) PVC spacers on the chopper they aren't very smooth or presumably true which I think is contributing to the vibration.
Anyone have any ideas on an alternative material or method to fine-tune it? I've been searching online McMaster etc. for spacers and such but haven't been able to come up with a reasonably low cost alternative. I can't spend an arm and a leg on it (ie: 10 x $6.50 each through Diamond Pacific).
|
|
|
Post by phil on Dec 14, 2013 12:01:22 GMT -5
|
|
Tommy
Administrator
Member since January 2013
Posts: 12,683
|
Post by Tommy on Dec 14, 2013 12:50:23 GMT -5
Thanks for the reply Phil. Yeah I've seen several options for nylon washers and those on Ebay at least gets the cost down in the $20 range. I was reading on the McMaster Carr product detail that nylon absorbs moisture - I wonder what that means for a wet application like this. I'm sure that being under pressure between the rollers would minimize any effect this might have.
|
|
|
Post by phil on Dec 14, 2013 15:47:37 GMT -5
Well, you could always stick a dowel inside that PVC and then cut it on your saw... you should be able to get any width you want that way....
|
|
|
Post by jakesrocks on Dec 14, 2013 17:12:53 GMT -5
Hey Tommy, I just bought a bunch of the nylon washers in the 3/4" ID size for a custom rebuild I'm doing. I'm putting 5 - 1/2" convex carving wheels on a vintage machine that used to hold an expando drum and a grinding wheel. The 3/4" nylon washers are 1/8" thick, and can be stacked to give good control over space between the wheels. I'm using 3/4" milled stainless washers on each side of the wheels to give a larger contact area, This should prevent any wheel wobble.
Never heard of solid nylon absorbing water.
|
|
QuailRiver
fully equipped rock polisher
Member since May 2008
Posts: 1,632
|
Post by QuailRiver on Dec 14, 2013 17:55:27 GMT -5
I use bronze sleeve bearings with a washer or two between the wheel and the sleeve bearing. Any good industrial supply company should have them.
|
|
juzwuz
has rocks in the head
Member since April 2010
Posts: 526
|
Post by juzwuz on Dec 14, 2013 18:33:21 GMT -5
|
|
Deleted
Deleted Member
Member since January 1970
Posts: 0
|
Post by Deleted on Dec 14, 2013 19:51:51 GMT -5
Nylon has about 15-18% water already in it. In 1992-1996 I worked for a sales firm that repped a very large molding company. Our product line was all the buckles for backpacks. Once I had a client complaining the side squeeze buckles were shattering on first use. I called my contact at the factory and the response was put 1.5 cups of boiling water in the bag with the buckles and let sit over night. The next day the bag was dry and the buckles did not break. They had absorbed all the water. I do not believe they will dissolve too much water, specially in a non stress no load environment like a spacer. If anything in the wet enviro they may swell just a little bit and make the space tighter.
|
|
Tommy
Administrator
Member since January 2013
Posts: 12,683
|
Post by Tommy on Dec 14, 2013 20:39:28 GMT -5
Thanks for the responses all. I ended up making a day-long project out of it - went to homey-d and bought a new fine tooth "plywood and plastics" blade for the 10" chop saw and recut all the PVC spacers again at 5/8" It turned out pretty good - Bunching the rollers up closer to the center point cut way down on the vibration. She's running smoother than ever and sporting a new 140 grit nova I just got in the mail yesterday :-) One more roller to go and she'll be complete.
|
|
|
Post by johnjsgems on Dec 15, 2013 14:37:34 GMT -5
That's a lot of wheels. It would drive me nuts having wheels so close together. I had to make my Genie a 4 wheels at a time machine for the fossils and other big pieces I cut.
|
|