How difficult/expensve is it to get custom o-rings made?

[winchman]

I know some one who would make them as in mold them not glue the together but I suspect it would be worth the cost

 

[Mr Fro]

I know some one who would make them as in mold them not glue the together but I suspect it would be worth the cost

I've got an injection moulding machine so if there's a model for them or the cavity I could try doing a few shots.

I think the machine tops out at 200 C so I don't know if that'll be enough for the material you need.

 

[TEO]

How much is a tube of Super Glue now a days ?
Find one thats a bit bigger and cut it down to size and then super glue the ends together.

+1
This works fine fine it many times in a variety of old bikes

 

[mangocrazy]

I've got an injection moulding machine so if there's a model for them or the cavity I could try doing a few shots.

I think the machine tops out at 200 C so I don't know if that'll be enough for the material you need.

I have a spare fuel tap that I dismantled for spares that the gasket/o-ring sits in. I'll take a photo of it and hopefully you can see if it might work. Not sure what Viton's temp tolerance is. I'll see what I can find out.

 

[Mr Fro]

I have a spare fuel tap that I dismantled for spares that the gasket/o-ring sits in. I'll take a photo of it and hopefully you can see if it might work. Not sure what Viton's temp tolerance is. I'll see what I can find out.

Yeah, sure. It would certainly be intersting as I've not done much with it.

 

[zzr1200]

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DN6 7BD
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hth

 

[bricol]

Frankly, I doubt it. There is no place on the gasket where it is double thickness. And it's not something I really would want to try out when better options are available.

I'm assuming there is a recess in the tap for the three-ring Olympic ring style seal to be placed in? So place three o-rings in the recess, hold in with silicon grease, lower tank onto tap and bolt up.

Or simply cut a suitable shaped seal out of suitable thick piece of viton sheet - or even PTFE sheet. Allow room for it to compress and squeeze out a bit. I'm also guessing it's not under too much pressure, just tank volume.

 

[mangocrazy]

I'm assuming there is a recess in the tap for the three-ring Olympic ring style seal to be placed in? So place three o-rings in the recess, hold in with silicon grease, lower tank onto tap and bolt up.

Or simply cut a suitable shaped seal out of suitable thick piece of viton sheet - or even PTFE sheet. Allow room for it to compress and squeeze out a bit. I'm also guessing it's not under too much pressure, just tank volume.

I don't believe that what you suggest is workable without cutting the o-rings, which would defeat the purpose of the experiment. You would be trying to cram too much material into too small a space and it simply wouldn't seal. And cutting a seal out of Viton sheet would be a very fiddly and quite tricky job.

@Mr Fro here are a couple of pics of the relevant part of the tap and the o-ring. I'd be very happy to send you these parts if you want to take detailed measurements.

And with the seal removed:

 

[Mr Fro]

I don't believe that what you suggest is workable without cutting the o-rings, which would defeat the purpose of the experiment. You would be trying to cram too much material into too small a space and it simply wouldn't seal. And cutting a seal out of Viton sheet would be a very fiddly and quite tricky job.

@Mr Fro here are a couple of pics of the relevant part of the tap and the o-ring. I'd be very happy to send you these parts if you want to take detailed measurements.

View attachment 354731

And with the seal removed:


View attachment 354732

Sure, sounds like a plan. I'll PM you my details.

I just remembered that I've got some black flexible resin for the printer so I'll do some in that first. I don't know if it'll be petrol proof but it'll be fun finding out.

Disclaimer: I offer no guarantee of success and in all probability, it'll be an abject failure... I'll have a go though.

 

[mangocrazy]

Excellent stuff. All done in the spirit of scientific enquiry...

 

[Mr Fro]

Excellent stuff. All done in the spirit of scientific enquiry...

Oh absolutely.

I've got some spare components already printed from the flexible resin so I'll chuck some in a jar of petrol and see how they get on.

I'll do the same with some of the injection moulding material while I'm at it.

 

[mtt.tr]

What's wrong with the £9 rebuild kits?

 

[mangocrazy]

What's wrong with the £9 rebuild kits?

Absolutely nothing! And I'll almost certainly be getting one. But I'd be interested to see where Mr Fro's injection moulding could lead to. Realistically, unless we hit upon a material that has as good resistance to ethanol and sealing capabilities as Viton there wouldn't be much point in continuing. But it's all about the journey, I think...