TOPIC:

Hi
As I said earlier :-
I have been using this Seal from South Coast Seal UK
Mechanical Seal
Part No SBS/012LSS/Can11
Size 12mm Job No 12372

And I paid about £15 GBP last time so its about right

Has anyone ask South Coast for the new shorter seal?

Cheers Pete

Hi Folks,
yes that is the corresponding South Coast Seals number and price. I've just ordered one up and will report back on how it goes. Got my other bike on the ramp to finish first though so might be a couple of weeks.
Alan.

zeroviz wrote:

Hi Mike
....
Going to pursue making a new shaft and costing to make more via cnc

I'll also need a new pump shaft so let us know how it goes.

Mike



I've measured my tatty shaft and get the following measurements - close??
We would also have to consider tolerances, steel type, hardening (if required) etc. before getting anything made.

on the 31mm side there you can see a little step
The inner part is for the bearing and i measured 11,97mm
The outer part is for the pulley and i measured 11,82mm
The inner part is about 17mm long from the 'ring'
The diameter for the impeller is 12,02mm
Length is only 59mm, with 26mm on the short side.
That's what i have found on my shaft i have here.
Somewhere there must be some more shafts

ciao Joachim

I visited a couple of heat treatment places, one tested the hardness of the shaft. (H RC 20 )
(Pemopa pump shaft was also HRC 20, guy thought it was likely 304)
Vacuum heat treatment is cheap enough to do a batch, but still might require a final clean up machining.
This is using 420 stainless which can be hardened to HRC 50 then tempered, and still has reasonable corrosion resistance.
One place which also has extensive cnc setup suggested just getting them machined from a more exotic alloy which would be about HRC 30 and would need no heat treatment/tempering.
I will get together a CAD drawing a get a quote, and also for the pemopa pump.

Just tried machining some 420 rod in the lathe and its pretty easy to get a ok finish. I'm waiting on some new tooling. Also waiting for this bloody flu to go away :-/
Edit...... I just tried machining to a point where bearing has slight resistance to being pushed on.
This is 11.997 which is about right looking at bearing shaft tolerances

My pump shaft dimensions in photo. Bearing fretting (spinning and wearing shaft) accounts for
most of the deviation from the 11.98 I think it should be
Other dimensions of interest;

Pulley bore 11.79
Impellor bore. 11.96
Brand new skf 6001. 11.991

This is all wonderfully useful information. I'm sure you have CNC places in mind but you could do worse than contact Terry at TS CNC who made up the custom small end bush for my 98. Very helpful and a fantastically equipped workshop:

www.tscnc.co.uk/main