Nice job Glen,
It's amazing what results a bit of elbow grease can achieve.
I tried the wider shoe'd TLS on my A10 and gave up and sold it (the TLS). I'm keeping my eyes open for a narrow version. I'm sure Julian quoted the part numbers at one point (maybe on other forum) so if I dig that out I'll link it or add the part number for the one that fits the SR hub.
Must look out the Aircraft Spruce you talk about to see if it's available here - it's always great to find an economic version of something we use every day.
Looking good Glen - keep up the good work.
Raymond.
The problem with the wide shoes of the TLS fitted to the SR drum is that area in the drum where the spoke ends reside.
The shoes will contact the high spots of the casting in this area and this causes extreme pulsation. Grinding down the areas that made contact in that strip helped ease the pulsation, but some remained, due to an out of round drum.
The wheel wouldn't quite fit in the lathe (18.5" swing) so I was contemplating a setup on the mill for trueing the drum.
It occurred that the sticky Emery paper method for arcing shoes to drum could work in reverse for trueing the drum.
Even a few thou out of round makes a lot of pulsation and a few thou can easily be removed with emery paper.
The method is to cut some strips of self adhesive backed sandpaper or emery paper and stick them on the linings. Put the brake plate into the wheel and tighten the spindle nut with the brakes applied. This was all done with the wheel blocked up but laid flat on the workbench.
I used a bar clamp to hold the brake on lightly then started to rotate the brake plate. Initially the plate would drag heavily in some areas and run free in others. About 30 minutes of this and one fresh application of emery paper had the brake plate turning with identical drag all of the way around.
On trial all pulsation was gone.
I used the bike like this for awhile then decided to fit the a65 drum and rim for a full contact setup. The a65 drum needed the same sticky Emery treatment to get rid of pulsation.
The full a65 setup is marginally stronger than the previous bitsa 2 ls but should wear a lot less and would be less likely to overheat.
This is the old Sr wheel and drum with its problematic bumpy spoke end area.
