Originally Posted by
avhed
What is the composition of freewheel gear cogs and can they be welded together without significant loss in strength?
I want weld only the inner ring of one cog (ground down enough to use as a spacer between gears) to an intact cog. this is to try for extra gear on the middle step of a freewheel body?
I have the Shimano MF-7400 Freewheel Body in mind. Obviously all spacers on this freewheel will be ground down to a 9 speed gap. (4.34mm)
If there won't be much stress on the weld, since it's just a spacer, then it should be fine with a few tack welds. That will minimize heat and possible warping.
If it is just a spacer, why does it need to be attached to a cog ?
If it increases the freewheel width, you may need a longer axle, and a bit of "oomph" to spread the dropouts when installing the wheel.