rootboy 

For those who might be interested. Inspired by seeing several requests over on the Classic Rendezvous list for a "stop pin" for their Campagnolo Record derailleurs, I figured I'd try to make one. Not being a machinist, this took me way longer than it might have. I'm a near-complete novice on my machines. I started with a piece of 3/8 stainless steel, milled some flats on it to form a 7 mm hex. This old Benchmaster mill is pretty loose, but it works OK.



I turned a shank down to 3/16. Not having a M5 x .8 round die I took the advice of a list member and used a 3/16-32 die instead, which is close enough for a class B fit. M5 x .80 die still in the mail.



I shaped most of the body of the pin by roughing it out on the lathe and finishing it with files in the lathe.



I then cut off the piece and mounted it in a brass rod drilled and tapped to accept it, to finish shaping the pin.


Here's the finished product, top one in pic. Original below it.


And mounted on a Record derailleur.


Thanks for looking.

oddjob2

Scott,
You are a true craftsman/artisan!

WNG

Nice work!

toytech

Nice work!

shoota 

Dude nice work!

lofter

Very nice, I need a shimano pitch ten locking in french 33x1 threading. far as I know never seen one, they only made a pitch ten thread and a standard thread . not a French threaded one . the project im currently working on is a rare gitane aero track frame. the catalog says mavic hubs pitch ten drive train . got the hubs , standard threaded pitch ten cog , chain , and working on the crank , but have yet to hear of a French threaded locking. If anyone has heard of a threaded one please say so . I think mavic probably helped out gitane on this project and made one for them.

southpawboston

Outstanding! I bet there will be a demand for these, especially among the CR crowd.

whatwolf

I hope to one day be a near-complete novice at stuff like that ...

Looks fun.

Grand Bois

Please don't help Lofter out unless he agrees to post pictures of his bikes. I remember seeing a couple of them and they are awesome.

Drillium Dude 

WOW! I continue to be completely floored every time you break out your tools and go to work, Scott!

Makes me wish I had a need for this (like the special NR RD bolt for those pesky Frenchie bikes).

DD

Chombi

Geeze Rootboy!, After seeing this one, surely, fabricating an RD like a Mavic "erector style" 851 SSC would be peanuts for you to do with your skills! You might just put some CNC machines out of business!

jiangshi

Machine shop skills are cool. Time to mess around with them is priceless.

Nice job, and no, I don't need/want one

thirdgenbird

This fall I will have a South Bend c9 in my garage. It need some light restoring, and I've never used a lathe, but I'm pumped at the opportunities. It was originally my grandfathers.

jimmuller 

Nice work! I'm looking for a French tandem headset. Can you make one of those? 30mm crown race, 28 x 1tpmm. Next week would be nice.

auchencrow

Genius!

rootboy 

Oh, you're too kind amigo. Thank you.
Notice how my ball is slightly larger than the original.
A genius wouldn't have such big balls.

...er something.

rootboy 

...thanks everyone. It is fun, and I am very fortunate to have more time on my hands than any man deserves.
Now...if I can find those guys on the list who were looking for one of these.
I make this kind of stuff for fun, not profit, if anybody needs one.

rootboy 

There were a couple guys looking SouthPaw...they'll pipe up I hope. Thanks.

EDIT: got this note just now from a fellow in England. Heh ...heh ...figures.
maybe not so un-obtainable as I thought. funny....

"Challenging exercise I am sure, but don't lose too much sleep over it as I sent the 2 guys who needed them new old stock originals a few days ago."

IthaDan 

Very impressive work. I love seeing how things like this are made and the tooling/clamping decisions to make it happen.

Zinger

I used to have one. Mine didn't have the gear box but had a full set of changeable spur gears. Had a 3c collet closer too. They are a little slow for high speed polishing but they actually make nice little collet machine as well as a hobby lathe. The leather belt drive is actually pretty fast to work with as compared to a modern gear head lathe.

I'm trying to ID the OPs lathe.....Old Clausing maybe?
You can also use a simple hex collet block and vise instead of the indexer for milling the hex. That's a cool little bench mill

And you ain't never going to keep up with a CNC lathe for mass producing that part, btw. Even faster is a screw machine using hex stock.

16Victor

Ahh we've talked about this before but I'm forgetful and lazy...nice Benchmaster, and is that a Logan lathe? Regardless of your experience, nice work indeed. I'd have struggled on my Van Norman and my Logan. If you want to produce in quantity, I have access to a machining R&D lab, a super programmer, and a Mazak Integrex i200s. Won't be free but you might break even

rootboy 

Thanks 16V. It turns out there's a guy in England who has a NOS stash of these so it looks as though this will be a one-off. I would have thought that given the relatively short tenure of the Record derailleur finding one of these would be the proverbial needle in a haystack, but I obviously underestimated the deeper vaults of some of the CR list members. Ah well, now I have a spare in case my pin ever falls out, and some valuable practice under my belt.

That is a Logan lathe. 10 inch with gear box. The old Benchmaster has seen better days, the lead screws are quite worn, but it works OK for things that don't require real precision.

Ex Pres 

I missed this in the CR thread. I need one, although had not put my request on-list. Info?

rootboy 

Yeah. I don't have any hex collets and, turns out finding 7 mm hex stock in stainless was near impossible. So, thought I train myself how to use that old index head, which I've had for years and never used.

rootboy 

It wasn't on the CR list. Info? Sure , there's one in the pic above that I just made. For sale. PM me if interested.