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Crossbow Tube Help?

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#1 Silly

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Posted 20 March 2017 - 07:48 AM

Dear NH,

I have been looking for some time now trying to find a buy link or store that sells the poly carb tube used as a plungertube for closed (flush) shelled 1995 crossbows. Also a link to a o ring or skirt seal used for that tubing would be appreciated aswell.

Thanks,
Silly.
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#2 Draconis

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Posted 20 March 2017 - 10:30 AM

If you don't want to shave down all of the internal ribs and such, you will want something like these: 8585K205 9245K41


Edited by Draconis, 20 March 2017 - 10:31 AM.

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#3 Silly

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Posted 20 March 2017 - 12:18 PM

If you don't want to shave down all of the internal ribs and such, you will want something like these: 8585K205 9245K41


Thanks! By any chance do you have a link for a skirt seal for those? (Plunger head/seal)

Edited by Silly, 20 March 2017 - 12:27 PM.

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#4 Maniacal Coyote

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Posted 20 March 2017 - 03:41 PM

Draconis, does a plunger tube made with those tubes need plates to position it?

 

Silly, I'm using 1-1/4" OD, 1-1/8" ID polycarbonate tubing. I had purchased it from McMaster last spring, thinking I could use it for a tornadobow, but I got stymied by my polycarb being hard to cut and not having a way to machine internals. I'm circumventing this problem with my school's bank of 3d printers and new laser cutter.

 

 

Big, somewhat related question: Will glues like Devcon® secure a tube of polycarb that's running through 3 1/4"-thick sheets of Delrin®? Or, will I need to cut the hole smaller and press-fit it?


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#5 Draconis

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Posted 20 March 2017 - 05:08 PM

Honestly, it has been so long since I had one open, I don't remember for sure.  It would certainly be advantageous for extra strength.


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#6 jwasko

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Posted 20 March 2017 - 10:10 PM

Will glues like Devcon® secure a tube of polycarb that's running through 3 1/4"-thick sheets of Delrin®? Or, will I need to cut the hole smaller and press-fit it?


Pretty sure you've asked this question before, and the answer is still: Nothing glues Delrin to anything else (not very well, anyway). Use pins and/or screws, or else don't use Delrin.

And I think I've cut polycarbonate tubing with a hacksaw before, but it's been a while so I could be wrong...it would have been a smaller diameter, so I may have used a pipe cutter (like http://www.plumbersc...FUpMDQodW-sDSQ)

Edited by jwasko, 20 March 2017 - 10:12 PM.

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#7 Maniacal Coyote

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Posted 20 March 2017 - 11:08 PM

Well, that's great. Looks like I'll have to wait for a printer to be available at school, and stick my order in there. At least the reinforcement pieces won't need any rafting. And, I can print up a set of plunger tube spacers for my TBow while I'm at it.  :ph34r:

 

Now, I need to figure out what to do with the slab of 1/4" thick Delrin I bought last month. And, the chunks of 1/4" Polycarb I've got sitting around.


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#8 Silly

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Posted 21 March 2017 - 09:40 AM

Anyone have the mcmaster number for a good skirt seal to use with this tube?
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#9 Silly

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Posted 22 March 2017 - 05:24 PM

Found a skirt seal I believe will work for the before mentioned tube. 

Link: https://www.mcmaster...3/3560/=16vc4oo

Number Alone: 9562K44


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#10 jwasko

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Posted 22 March 2017 - 08:21 PM

Not sure if you were looking for confirmation of that part, but I just found this: http://nerfhaven.com...-new-internals/

 

He used 9562K44 and a couple of fender washers to make a new plunger head, and he was using a 1 1/4 od 1 1/8 id polycarbonate plunger tube.


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#11 Silly

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Posted 22 March 2017 - 08:41 PM

Not sure if you were looking for confirmation of that part, but I just found this: http://nerfhaven.com...-new-internals/
 
He used 9562K44 and a couple of fender washers to make a new plunger head, and he was using a 1 1/4 od 1 1/8 id polycarbonate plunger tube.

Actually that's where I found the part in the first place. I plan to make a easy guide that's up to date for a crossbow mod. All of the ones in the mod directory are 2 or 3+ years old.

Edited by Silly, 22 March 2017 - 09:18 PM.

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