one for the mechanics

[mitzimad]

any ideas how to save my belt sander from going in the scrap the drive belt cog below has rounded the part that sould have a square key way its the usual cast ally stuff so welding and filling new flats is probably out

 

[funflair]

So does that mean that even the round bit is now oversize, if you have access to a lathe you could make a bush and then possibly put a grub screw through the boss onto the shaft.

Martin

 

[andy63]

Not sure i understand what you mean...
Is it the tooth profile on the cog which has been rounded( ie the teeth ) or are you saying the drive arrangement of the cog is worn.. should there be a square key in the now circular looking hole ..?
Andy.

 

[Carolyn and Kev]

Put the toothed drive wheel back on and drill down between the shaft and the cog where it touches the drive shaft with a i/8th drill bit in three places. Preferably equidistant around the shaft. Use 1/8 round bar cut to the depth of the drive wheel and glue into place in the three holes drilled out. Leave to dry and off you go.

Kev

 

[Geo]

File a new groove and fit a bigger Woodruff key assuming the drive shaft has a slot too

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[Stealaway]

Replace the centerpiece with steel square box section - file to fit shaft and gear.