Rubber Extrusion/Profiles

[Matt]

Guys

I've just bought a nice bit of ex-mod kit (Hawker Siddeley Checkweight), but its quite old and the rubber dust seal has perished.

its this O-----O profile, the Os fit in grooves and are about 6mm dia, its about 34mm wide, but could be wider.

Any suggestions where I could buy something similar? (woolies trim have something similar, but the Os are too small...

Thanks!

[ASL642]

Most people use bathroom scales!

Are these people any use? http://www.caledonianengineeringplastics.co.uk/es. What are you planning to weigh?

[mogbob]

Matt
Is the extrusion RM21 on http://www.vintagecarparts.co.uk what you are after ? It's an 11mm bead and 38 mm overall according to their website.
Bob

[Matt]

Im planning to weight vehicles and axle weights!

With stuff I have thats up to 1000kg (legally) on a single wheel

[Matt]

mogbob, I need a bead at each end, that appears to only have a bead at 1 end

[bmcecosse]

Why not just fit two O rings in the grooves - I can't see the bit in the middle really matters - or does it?

[Matt]

yeah... its what stops the rubbish get in the mechanism BMC!

Its that shape because the top plate moves in relation to the base when a vehicle drives on it

[bmcecosse]

Hmm -well obviously I don't know the machine - but I would hope the two O rings would keep the crap out? We weigh our locos by jacking up each wheel in turn just 'slightly' clear of the rail with a hydraulic pump and ram - and measure the pressure to do that - working out the weight from the area of the ram piston... And then we adjust the springs to get equal wheel weights.

[Matt]

The "O rings" just go in to a groove in the top and bottom plate.



The vehicle drives on to the top plate, this has a degree of movement in all directions. The O ring grooves are on the side, hence the request from a piece of rubber extrusion rather than O ring material, as the flat part acts as the dust seal...

Its also much easier to drive on to it, record weight, then drive off rather than jacking up (potentially) 8 times (vehicle + twin axle trailer)

[mogbob]

A picture paints a thousand words....
Let me confess my complete ignorance of the machinery involved at the outset.To me, it looks like a specialist piece of of kit...no doubt with a specialist price to go with it...if you can obtain a replacement.

Lateral thinking.... could you glue the flat surfaces of two normal extrusions together( with the " O " rings at either end ) or would two thicknesses of flat rubber not be flexible enough ?

If not , how about excess " flat" rubber removed and only glueing tabs left at regular intervals,fix it to the other untouched strip ?
Bob

[Matt]

I have found a few bits of extrusion that are the right shape, but not necessarily the right dimensions.

Its not that specialist, at the end of the day its just a pair of scales, but scales that go up to 3500kg

[IaininTenbury]

Try COH Baines, in Tunbridge, Kent. They make all the extrusions and many more that the classic car folk sell. They have a huge catalogue of sizes and profiles.

[Matt]

Thanks Iain - they appear to have what I need!