CF Base Drilling?

With a drill? 😉

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underdog

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are there premarked holes on the carbon fiber base for drilling? I plan
on getting one soon since my seat flexs way to much

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maflitto
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john_childs wrote a very good post about this, but it took me a while to
find it originally:

http://tinyurl.com/gduyx

That's what I used to figure out how to best drill my CF base, and it
came out quite well.

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entropy
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also, scroll all the way down the page.

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Is there a way to put the nuts on the inside and have the bolts go from
the bottom up into the seat?

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koebwil said:

Is there a way to put the nuts on the inside and have the bolts go from
the bottom up into the seat?

Yeah. Scott Wallis has some flanged, threaded inserts (i.e. nuts
without the hexagonal shape) that he epoxies into the seat base...
kinda sorta like the one you see in the lower right of this image:
[image:
http://www.textronfasteningsystems.com/database/images/vs_nut_small.jpg]
If you find one of these you just need to drill a hole large enough for
the threaded collar to go through, then epoxy the flange to the top of
the seat base (where the seat foam will sit). You'll need to ensure
your epoxy job is spot-on (the surfaces mate perfectly with each other,
are prepped and cleaned, the epoxy does not have bubbles, etc.)
otherwise you could torque them right off when tightening the screws.
The larger the flange you can find, the better off you'll be.

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koebwil said:

Is there a way to put the nuts on the inside and have the bolts go from
the bottom up into the seat?

Not with carriage bolts.

You could loosely follow these directions from George Barnes, and just
install all the nuts & bolts upside-down:

http://www.gb4mfg.com/gb4/air_seat.pdf

Keep in mind that if it isn't securely fastened and something comes
loose, you may have to remove the bumper, handle, seatcover and pad in
order to re-tighten the base bolts / nuts.

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maestro8 said:

Yeah. Scott Wallis has some flanged, threaded inserts (i.e. nuts
without the hexagonal shape) that he epoxies into the seat base...
kinda sorta like the one you see in the lower right of this image:
[image:
http://www.textronfasteningsystems.com/database/images/vs_nut_small.jpg]
If you find one of these you just need to drill a hole large enough for
the threaded collar to go through, then epoxy the flange to the top of
the seat base (where the seat foam will sit). You'll need to ensure
your epoxy job is spot-on (the surfaces mate perfectly with each other,
are prepped and cleaned, the epoxy does not have bubbles, etc.)
otherwise you could torque them right off when tightening the screws.
The larger the flange you can find, the better off you'll be.

I will definately look for those. Thanks.

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entropy said:

Not with carriage bolts.

You could loosely follow these directions from George Barnes, and just
install all the nuts & bolts upside-down:

http://www.gb4mfg.com/gb4/air_seat.pdf

Keep in mind that if it isn't securely fastened and something comes
loose, you may have to remove the bumper, handle, seatcover and pad in
order to re-tighten the base bolts / nuts.

I like the idea of a rubber bumper between the post and the base.

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koebwil

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You can get rivnuts which are threaded tubes which are deformed to hold
themselves in place with a rivnut gun, ive used them exstensively on
fibreglass and they're pretty good, tricky to get hold of tho.

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maestro8 said:

Yeah. Scott Wallis has some flanged, threaded inserts (i.e. nuts
without the hexagonal shape) that he epoxies into the seat base...
kinda sorta like the one you see in the lower right of this image:
[image:
http://www.textronfasteningsystems.com/database/images/vs_nut_small.jpg]
If you find one of these you just need to drill a hole large enough for
the threaded collar to go through, then epoxy the flange to the top of
the seat base (where the seat foam will sit). You'll need to ensure
your epoxy job is spot-on (the surfaces mate perfectly with each other,
are prepped and cleaned, the epoxy does not have bubbles, etc.)
otherwise you could torque them right off when tightening the screws.
The larger the flange you can find, the better off you'll be.

Max Dingemans (from the TCUC) uses the T-nuts in the carbon fiber base.
The T-nuts are designed to be pounded into wood (it's the one in the
above picture on the black square). For use on the CF base you cut off
three of the prongs. Drill a round hole for the threaded part and cut
a slot for the remaining prong. That remaining prong will keep it from
spinning. Then file down the excess that is sticking up on the other
side of the CF base.

The T-nut thing might be good if you're using a foam seat. I don't
think it would be good for an air seat because the nut and bolt will
stick up into the inside of the seat and that would be bad for the
tube.

I haven't tried the T-nut option. The advantage is that it would be
lighter than the carriage bolt option (carriage bolts are heavy).

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Alot of good stuff being said...

Heres one more thing to keep in mind: the little dots/indentations that
are on the cf base when you get it that are kind of the suggested
places to drill the holes can be wrong. Just ignore those are measure
where to drill the holes. Take your time. Thats it. 🙂

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