How to "fix" speed control bracket?

cllib · Post by **cllib** » Mon Feb 11, 2013 5:21 pm

Even though I purchased a new quadrant, the speed control doesn't turn smoothly.

I just wonder how to "bend" the wing in a vise?
If I "squeeze" in the vise, how do I control which side to bend?
Any picture I can look at?

If I used Bill's approach I can tighten the nylon nut and the gap would disappear. But it seems that I alignment of the worm and quadrant is still off.

Should I use trainguytom's approach? http://www.shopsmith.net/forums/showthr ... post113113

I will post an updated pictures later tonight.

Thanks for any advice.

charlese · Post by **charlese** » Mon Feb 11, 2013 6:04 pm

Do you mean the new bracket will not turn smoothly? Or, are you referring to the one shown in your photos.

cllib · Post by **cllib** » Mon Feb 11, 2013 8:16 pm

charlese wrote:Do you mean the new bracket will not turn smoothly? Or, are you referring to the one shown in your photos.

I only purchased the quadrant. The bracket is the original.

The parts in the second picture were all original.

griffmeister · Post by **griffmeister** » Mon Feb 11, 2013 11:16 pm

cllib wrote:I only purchased the quadrant. The bracket is the original.

The parts in the second picture were all original.

Your second picture really doesn't look that bad as far as alignment goes. I don't think you need to go to extremes to "blueprint" the assembly for smooth opeeration. Could it be that the new quadrant is just too new and the teeth just need to wear in? Maybe just lightly dressing the edges with a file might help if you dare.

cllib · Post by **cllib** » Tue Feb 12, 2013 12:08 am

griffmeister wrote:Your second picture really doesn't look that bad as far as alignment goes. I don't think you need to go to extremes to "blueprint" the assembly for smooth opeeration. Could it be that the new quadrant is just too new and the teeth just need to wear in? Maybe just lightly dressing the edges with a file might help if you dare.

Just tonight, I re-tightened the lock nut and the gap closed and then I back out the nut a little bit.

It seems the worm gear can turn more smoothly. I agree that the new quadrant is a factor. The gap before the tightening did affect the alignment. The alignment could be better.

I think I will live with it. will see how it work when I install it.

JPG · Post by **JPG** » Tue Feb 12, 2013 12:20 am

If the 'second' pix is the 'original', I would dress up the quadrant gear teeth with a file of the original and save the new one for later. The quadrant gear teeth are not all that bad. The worm gear aligns very well in the second pix.

If you look from the side as you encounter a 'stiff point, you can see where the teeth are binding. The worm gear will be touching the front side of a quadrant gear tooth and the rear side of another. That 'interference' must be relieved by filing. The area to be filed is likely where the quadrant gear has been deformed.

That judicious filing would also work for the new one. As a stiff point is encountered, wear points will show.

All above assumes the worm gear is not also bent, although the 'original' quadrant wear does not seem to indicate that.

It takes very little interference to cause it to 'jam'.

charlese · Post by **charlese** » Tue Feb 12, 2013 2:06 pm

Hoping this is pertinent - I purchased a speed control quadrant assembly to serve as a spare. I attempted to turn the shaft/worm gear by hand and it was too stiff. Touched up the teeth with a file, greased the unit and was still stiff. When I attached the speed control handle, it turned O.K.

Yes, it was stiff, but probably just needed some lube and turning. I doubt the filing did any good.