On Mon, 7 Jun 2021 23:06:55 -0400, Frank Krygowski
wrote:

On 6/7/2021 10:52 PM, Jeff Liebermann wrote:
On Mon, 7 Jun 2021 16:11:51 -0700 (PDT), Mark cleary
wrote:

So COVID has shot the groupsets of Shimano. I am not a dura-ace person and I still shift with cables. Are they going to be making or shipping Ultegra or 105 stuff. Maybe it all is dried but and in the end looking for it will never come. I would even go to a disk brake set up if I could find 105 stuff. I have Ultegra now but frankly 105 is just as good.
Deacon mark

While you're waiting, you might consider making your own parts (and
selling extra parts to others in your situation). For example:
https://stlbase.com/browse/bicycle+shimano/
https://www.yeggi.com/q/shimano/
Unfortunately, making the stamped steel cassette gears will probably
be too difficult. However, it might be possible to use a water jet
cutter to make the chainrings.
https://www.google.com/search?tbm=isch&q=waterjet+cutter+bicycle+chainrin g

Mo
https://www.google.com/search?q=3d+printed+bicycle+parts&tbm=isch

A bit more seriously:

Did you perhaps notice the large number of small Shimano components
that are available for downloading or purchase? I may not be very
serious, but others seem to think it might be a good idea.

I've sometimes thought it would be nice to have
access to a CNC mill,

That's also what I thought. So, I volunteered to update the CNC on a
friend's vertical mill:
http://www.learnbydestroying.com/jeffl/pics/CNC-conversion/index.html
It works and has been running for a few years. However, he won't let
me use it because he has it setup to produce some rather profitable
parts for a paying customer. If I tear down the setup to make my
parts, it's quite a project getting the mill setup again to make
paying parts. So, rather than make more efficient and accurate
fixturing, he just leaves it ready for the next paying order. I could
have done better by buying a small bench top mill.

to refurbish freewheel cogs. It would keep my
ancient SunTour freewheels going.

If you're going to go through all that trouble refurbishing gears, you
might as well make new gears from scratch. As long as you're removing
metal, it can all be done on a mill or lathe with an indexing or
dividing head:
https://www.google.com/search?q=indexing+head&tbm=isch
It might be tempting to sell a dividing head specifically drilled for
bicycle gears. Twisting the teeth slightly to make shifting possible
on a huge corn cob freewheel will probably require a fixture and
press, or some kind of stamping machine. I'm not sure if the
resulting gears will require heat treating. Purchasing all the
required equipment seems rather uneconomical, but borrowing the
machine time in a hobbyist or "makers" shop might be worthwhile.

As for refurbishing the teeth on existing gears, that might work even
if the teeth have developed a "hook". Adding metal is possible with a
MIG welder and trimming can be done with most anything that removes
metal, such as a gear tooth cutter, rotary grinder, or round hand
file. There's quite a bit on gear repair on YouTube.

--
Jeff Liebermann
PO Box 272 http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann AE6KS 831-336-2558