Passing tubes that can't be cut through bulkheads has been a tricky job in the past. For my footwell, I had the following parts cut to pass the bias-pedal adjuster through. However, I mis-ordered and only ordered 1. Thinking about things I have at least 3 other tubes/cables I need to get through a bulkhead and my laser-cutters have a minimum order policy.

These parts hold a grommet that is 6-7mm internal diameter, and are drilled for m5 bolts.

So, my question is this. When I get bulk order prices, does anyone want to jump in with me? At the moment, getting one-offs cut is @£7.50 per pair, which is very expensive but the costs come down considerably for medium quantities.

I'm doing this as a favour, so there isn't going to be a mark-up; just the cost to make and collect, put in an envelope and post.

Anyone interested enough for me to understand what bulk-discount I should order?


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What's wrong with an 8-10 mm hole saw and a bit of tube welded in? It's easier to angle it to suit that way too.

Well, this is removable, and when in place clamps the grommet. Nothing will move once clamped. Do you have a picture of what you mean?

Thanks
M

I can't find any specific pics, but it would just be a short bit of tube that is larger then the thing passing through it welded where your grommet would be, with a normal rubber bulkhead grommet on it if really required.

Why would you need it to be removable? Surely, once you've decided upon the tubings location, it would never need to be removed? Actually, if the thing passes through the grommet anyway, why the need for a larger plate? Can you not just use a grommet as usual?

I suspect I'm missing part of your reasoning for this.......

Generally speaking, it's not the tube that is the issue. So for instance with the break bias adjuster I actually need to pass a 14mm diameter hex head through the panel (which fastens onto the balance bar) and then I end up with a 14mm hole, but need to seal around the 7mm cable that rotates the head.

My oil pressure, water temp and oil temp gauges are all mechanical; the vibrations tend to kill the electronic ones. With these, there's a take-off adapter (usually a brass thing) attached to the capillary tube - again way wider than the actual tube that goes through the bulkhead. So, the brass thing goes through the builkhead from the back of the dash and needs sealing.

If I'd mentioned that context at the start this may make a little more sense.

I've also found that stuff needs to come off. Not necessarily often, but when i've made a permanent 'one-off' job and then found I've had to undo it, the surgery is often worse second time around. And this time I had a bunch of parts coming back from the laser cutters so knocking these out was half an hours work.

Here are a couple of pics to illustrate

before

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Just the tip as the adjuster goes through the hole

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almost final result:

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It's worth pointing out that I haven't got all the nutserts in at the back yet - when they are in, the bolts line up properly and the gap between the plates is closed up and the cable is firmly clamped but not pinched.

Thanks
Mark

I see. Can you not just use closed grommets in this case? All you need to do is punch the right sized hole in the middle of them. Would save you so much time and effort.

No, he wants to pass a 14mm hex through the hole and then seal around a 7mm cable/tube, attached to the 14mm hex !
Poking a 14mm hole through a blind grommet to allow a 14mm hex through will not then all the grommet seal around a smaller, 7mm cable/tube !

Regards
Jon

quote:

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Originally posted by slingshot2000
No, he wants to pass a 14mm hex through the hole and then seal around a 7mm cable/tube, attached to the 14mm hex !
Poking a 14mm hole through a blind grommet to allow a 14mm hex through will not then all the grommet seal around a smaller, 7mm cable/tube !

Regards
Jon

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quote:

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Originally posted by slingshot2000
No, he wants to pass a 14mm hex through the hole and then seal around a 7mm cable/tube, attached to the 14mm hex !
Poking a 14mm hole through a blind grommet to allow a 14mm hex through will not then all the grommet seal around a smaller, 7mm cable/tube !

Regards
Jon

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Dear Members of the Brotherhood Of The Hexagonal Hole

Here are a couple of pictures of the completed article.

The first shows the clamp now it's in place and for something with the weight of a bias adjuster cable, it can still support the weight - it doesn't sit on the chassis member.


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And finally, here it is attached to the pedal box


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You may think I'm mad, but I'm one of the happy ones.