grayson875
off to a rocking start
Member since March 2020
Posts: 4
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Post by grayson875 on Apr 5, 2020 12:19:41 GMT -5
Hi All, New to Forum. Thanks for all your great postings, I have found the information and knowledge extremely valuable. Appreciate all the postings!! Recently I have been reconditioning my Grandfather's 20" Slab Saw by Mohave Industries, replacing the hardware with stainless steel along with new drive and feed motors, as well as a new 301 MK Blade. The Poly Products Arbor is pretty beat up and has too much run-out or wobble, therefore I searching for a replacement. I would appreciate any leads on a potential supply source or ideas on a suitable replacement design. The Arbor is the C6 - 3/4" diameter 12.5" long arbor (see below)
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Post by catmandewe on Apr 5, 2020 12:52:53 GMT -5
Just replace the bearings, the arbor should be fine.
Tony
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grayson875
off to a rocking start
Member since March 2020
Posts: 4
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Post by grayson875 on Apr 5, 2020 13:31:38 GMT -5
Thanks, Yes I did that, but blade still has wobble. Looking for a replacement source
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Post by oregon on Apr 5, 2020 17:06:21 GMT -5
Thanks, Yes I did that, but blade still has wobble. Looking for a replacement source if the bearings were snug (press fit) then the wobble has to be the shaft or blade... Doesn't sound like the arbor is the culprit, but it looks like you could just put two pillow blocks in place instead.
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nik
spending too much on rocks
Member since May 2019
Posts: 315
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Post by nik on Apr 5, 2020 23:22:45 GMT -5
It would be easy enough to get a new shaft made at a machine shop if that is the culprit. Otherwise I'd look closely at the flange washers, check for burs and defects, and make sure they are actually recessed center drive washers rather than just flat common hardware. If the bearings fit properly in the casting, it is hard for me to imagine that there is anything wrong with it.
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Post by catmandewe on Apr 6, 2020 12:12:45 GMT -5
Take your colletts (blade washers) off and put some fine sandpaper on a flat sheet of glass or any flat surface, run the smooth side of the colletts against the fine sandpaper making sure to keep it flat, then put it all back together and see if you still have wobble. If you still have wobble it is most likely your blade.
Tony
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carver
starting to shine!
Member since November 2019
Posts: 36
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Post by carver on Apr 6, 2020 13:16:35 GMT -5
Did you sledge hammer out the shaft when you replaced the bearings? I had this same arbor and the exact same problem a year ago. With that said, I accidently ran across that arbor on eBay the other day. Within the last week. I couldn't find it again so it must have been not easily searchable. Pillow blocks are a good start, flanges could be the issue but for me sledging out the shaft may have been the culprit. Did you try not over tightening the nut? That seemed to be an issue with mine. I was over tightening it which caused a pinch at the center of the blade and then wobble. I finally found a saw blade arbor from Covington for 300 the fit but as long as your issue isn't the shaft you can easily put in pillow block bearings with the black side walls (sealed rubber to keep out the grit). All you need are ones with the correct ID (inner diameter) of your shaft that have a locking collar. I think it was 3/4" but I don't recall. Then you can mount them in the correct location and reuse the shaft.
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grayson875
off to a rocking start
Member since March 2020
Posts: 4
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Post by grayson875 on Apr 6, 2020 14:06:43 GMT -5
Thanks for all the tips, great to get other minds and experiences working the problem, I decided to remove the shaft by taking apart the race of one bearing and tapping out the shaft and ordered 2 pillow block bearing and try a cheap set-up to observe the shaft rotation, although the shaft is pitted it seems to be true, the flange washers are pitted, so I ordered 2 new flange washers from HP. Will advise once I get the parts and new set-up installed. Still will continue to look for another Poly Products replacement, seems like they're hard to come by!
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carver
starting to shine!
Member since November 2019
Posts: 36
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Post by carver on Apr 7, 2020 1:28:33 GMT -5
Thanks for all the tips, great to get other minds and experiences working the problem, I decided to remove the shaft by taking apart the race of one bearing and tapping out the shaft and ordered 2 pillow block bearing and try a cheap set-up to observe the shaft rotation, although the shaft is pitted it seems to be true, the flange washers are pitted, so I ordered 2 new flange washers from HP. Will advise once I get the parts and new set-up installed. Still will continue to look for another Poly Products replacement, seems like they're hard to come by! Let us know how it turns out. When I first got into lapidary I had the EXACT same issue with the EXACT same arbor and I know how frustrating it can be to pinpoint the issue. Hopefully your shaft is fine because if so then then the problem is much easier to solve with the pillow blocks. I had the same flanges as you as well, try just loosely tightening the nut rather then cracking down on it, that helped reduce wobble considerably on my set up. Where are you located?
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grayson875
off to a rocking start
Member since March 2020
Posts: 4
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Post by grayson875 on Apr 7, 2020 14:05:13 GMT -5
Thanks, I'm in the Florida panhandle.
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