29 May
2005
29 May
'05
12:55 a.m.
On 29 May, 2005, at 02:03, Tony Duell wrote:
Roughly, yes (although I've never worked on a Tractor...). I think of
them as :
Allen : Triangular wave rapped round a circle
Torx : Sine wave rapped round a circle
Bristol : Square wave wrapped round a circle
Very approximate, of course (and certainly not enough to machine a tool
to fit them), but it gives the right idea.
http://www.mgs4u.com/bristol-wrench-spline.htm
And at 15 USD for a holder with one bit, I would not say the price is
unreasonable for a quality tool. About the same as I paid for a cheap
Chinese set of some 100 bits of useable bot not great bits.
...
That is not an excuse. Anyone working on IBM 5155s (or
for that
matter=20
Friden Flexowriters, which are stuffed with setscrews needing
Bristol=20
Spline drivers) should have a set.=20
Are they the ones that are the same shape as a tractor PTO shaft?
11mm is relatively common. It's 12mm that I find somewhat obscure, and
which Citroen seem to use to excess...
12mm is one of the common sizes around here.
I never had any problem with tools for any of my Citro?ns, except that
I had to get the socket for the central nut which holds the fan to the
shaft on the GS from a heavy equipment store. If you have the original
service manuals, you will see that they include instructions on how to
make a number of useful special tools. I have heard that their
apprentice mechanics had toolmaking as an important part of the
training.
--
-bv