Mark v speed controller problem

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Majjr
Bronze Member
Posts: 2
Joined: Mon Apr 15, 2024 1:57 pm

Mark v speed controller problem

Post by Majjr »

The bearing in button with clip that is connected to the sheeve on my speed controller has burned out twice with little use. I oil that bearing every time I use the machine. Can’t understand what is making it burn out. Has anyone else had this problem?
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chapmanruss
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Joined: Tue Aug 26, 2014 8:16 pm
Location: near Portland, Oregon

Re: Mark v speed controller problem

Post by chapmanruss »

Majjr,

Welcome to the Shopsmith Forum.

I have not had that problem. That is a sealed Bearing and should not need oiling. Over time sealed bearings will "wear" out which does happen. I have to wonder where you are getting your replacements from. Shopsmith only sells it installed in the Floating Sheave (part number 515556) of the Idler Shaft Pulley Assembly, so some owners elect to get just a replacement bearing elsewhere. This is not necessarily a bad thing, but improper installation could cause a failure. A lower quality bearing not able to handle the RPMs of the Idler Shaft could be the problem. Keep in mind the Idler shaft rotates at 1.7 times the speed of the Quill. That's over 8800 RPMs at top speed.
Russ

Mark V completely upgraded to Mark 7
Mark V 520
All SPT's & 2 Power Stations
Model 10ER S/N R64000 first one I restored on bench w/ metal ends & retractable casters.
Has Speed Changer, 4E Jointer, Jig Saw with lamp, a complete set of original accessories & much more.
Model 10E's S/N's 1076 & 1077 oldest ones I have restored. Mark 2 S/N 85959 restored. Others to be restored.
edma194
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Posts: 1920
Joined: Fri Jun 19, 2020 4:08 pm

Re: Mark v speed controller problem

Post by edma194 »

If the quadrant that pushes on the bearing is not centered and perpendicular to the shaft on the upper sheaves you'll need excessive force on the speed dial to move the sheaves. Also, the outer sheave has to slide on the shaft to change speeds, if that's not sliding smoothly it could require excessive force to change speed. Really anything that prevents the upper sheaves from opening and closing can be the problem. The problem I've seen is the roll pin that the quadrant pivots on can be loose and some users have replaced it with a nut and bolt.
Ed from Rhode Island

510 PowerPro Double Tilt:Greenie PowerPro Drill Press:500 Sanding Shorty w/Belt&Strip Sanders
Super Sawsmith 2000:Scroll Saw w/Stand:Joint-Matic:Power Station:Power Stand:Bandsaw:Joiner:Jigsaw
1961 Goldie:1960 Sawsmith RAS:10ER
edma194
Platinum Member
Posts: 1920
Joined: Fri Jun 19, 2020 4:08 pm

Re: Mark v speed controller problem

Post by edma194 »

Majjr, here is a link to Bill Mayo's headstock improvement guide: (download/file.php?id=34357)

I found that in this thread: viewtopic.php?p=314807#p314807

Look around on the forum and you should find other references to this.
Ed from Rhode Island

510 PowerPro Double Tilt:Greenie PowerPro Drill Press:500 Sanding Shorty w/Belt&Strip Sanders
Super Sawsmith 2000:Scroll Saw w/Stand:Joint-Matic:Power Station:Power Stand:Bandsaw:Joiner:Jigsaw
1961 Goldie:1960 Sawsmith RAS:10ER
Majjr
Bronze Member
Posts: 2
Joined: Mon Apr 15, 2024 1:57 pm

Re: Mark v speed controller problem

Post by Majjr »

Thank you.
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