Jump to content


Photo

Crossbow Mod Supplement

Extra stuffs

5 replies to this topic

#1 Split

Split

    Member

  • Members
  • 1,771 posts
  • Location:Hammonton
  • State:New Jersey
  • Country:United States

Posted 22 August 2009 - 04:31 PM

I have some more stuff to add to this thread I made about crossbow mods not too long ago.

Instead of putting this all on the LGLF site, I'm just going to put it here.

If you're looking for a bit of exigence, I just finished a before/after getup on a crossbow for someone:
Posted Image
Posted Image
Posted Image

A large majority of this information is going to refer to what I consider to be one of the most important parts in a working springer - the plunger head.

As a general rule, if you're using a replaced plunger tube via the writeup, using the stock plunger head is a great option, but only if it's in good condition. Tears are fixable with goop, though it may need to be redone after 2-3 wars I've noticed. I have not found a good solution to wrinkles in the skirt.

Instead, I've found a mcmaster part that suits our applications perfectly. It's just like the skirt part I found for the +bow, but this one works extremely well in both the replaced and original plunger tubes.
It's part number 9562K45 and looks like this:
Posted Image

It works really well on replaced plunger rods too. Getting plunger heads onto replaced rods has been an issue I've seen lately. My solution is pretty straight forward:
Posted Image
You need a 1.5" length bolt with thread matching the plunger rod, two washers and a spacer matching the inside of the plunger head.
-For the stock plunger head, use washers 9/16" OD and matching the thread of your bolt. I used mcmaster part 91090A102 for the one in the photo. The spacer you'll need is 90309A028, set to whatever thread you need.
-For the replaced plunger head, use washers 7/8" OD and matching the thread of your bolt. I would use mcmaster part 95630A460 here. The spacer you'll need is 92510A795 plus 90309A027, set to whatever thread you need.


Another part I never really felt was adequately covered were crossbow catches. My attempts to make one out of 1/4" thick polycarbonate weren't really successful, so I turned to another material. What follows is the template to make a replacement catch from 1/16" steel, part number 9516K165:
(Should be up soon)

The result:
Posted Image

I also drew up a template of an actual crossbow catch. I'm not sure if the jpeg will print out exactly scale for you guys, so if you need to adjust, the center thickness should be 1/16"
Posted Image


Some other quick notes:
When finding the part for a replacement plunger tube, remember that the pipe extensions work off of the OD, not the ID, so there is some variance in it. Some are bigger, some are smaller. I've worked with both; both have worked fine. Put a quarter wrap of e-tape around the coupler, or however much, goop it up, and run some screws/bolts through it to keep it steady and you should be fine. It may be helpful to bring a coupler with you to see how well it fits into the part.

Don't hesitate to use electrical tape around the rings to hold the plunger tube in place. It creates tension and friction, which in turn keeps the plunger tube from spinning - useful for speedloaders.
Posted Image

DT3 arrow shooter springs are getting harder and harder to find. For a nearly identical replacement, try a section of 9637K25, also known as the +bow spring's little brother. 8" seems to work well, but feel free to experiment. You're encouraged to post your individual results here.

A quick refresher on removable 2k turrets - OMC Petg fits right over the inlet perfectly. Goop it up, and run some pvc over it for a turret to go into pvc couplers. Have a looksee.

Edited by Split, 09 October 2009 - 10:24 AM.

  • 0
Teehee.

#2 flamincows

flamincows

    Member

  • Members
  • 195 posts
  • Location:Grove City, PA

Posted 22 August 2009 - 09:26 PM

I've been using a section of the '[k25] spring for a while now and it's worked wonderfully for me. However for some reason if the spring rotates a certain way on the spring rest, the blaster won't catch. I'm not entirely sure why, but I use a sliding breech so it really isn't a big deal. I need to get around to situating the plunger tube in the shell a little more snugly. That should fix the problem.

Anyway, thanks for posting this split. It looks pretty tight. Your exhaustive guide really helped me out, and this pretty much covers anything that that didn't.

A few questions:
What are the dimensions of the aluminum bar you're you using to replace the plunger rod, and do you think a new catch could be made from flattened out sch80? I'm going to try it if my catch ever breaks regardless; I just thought I'd get an opinion first.
also, how exactly did you go about putting the shell back together?
  • 0
Sex Dwarves: Drug test? What kinds of drugs are we testing?

#3 Split

Split

    Member

  • Members
  • 1,771 posts
  • Location:Hammonton
  • State:New Jersey
  • Country:United States

Posted 22 August 2009 - 09:40 PM

Very nice post flamincows. It's good to know there is at least one competent '09 member.

As for replacement rods, 'Slug was making them for a while. It's 3/8" square aluminum.

Sch80 would be pretty difficult. From what I hear, they make PVC sheet, which would be far better than flattened tube. The main difficulty is getting the edges to be perfectly 1/16" all the way down without wavering. As I mentioned, I couldn't pull that off out of 1/4" polycarb, so I resorted to something with more tensile strength per thickness.

This shell was a trip. Bondo, hot glue, transplants from other blasters make up almost all of the body work though.

Edit in response to post below: Yeah, the plastic on steel should be fine, unless you like, sharpen the bottom edge. As for Slug, last I heard, he stopped making them about a month ago. I'm not sure of his reason - I've heard a couple different versions - but I'm sure it's a reasonable one, knowing him.

Edited by Split, 22 August 2009 - 10:45 PM.

  • 0
Teehee.

#4 flamincows

flamincows

    Member

  • Members
  • 195 posts
  • Location:Grove City, PA

Posted 22 August 2009 - 10:13 PM

Thanks for the information; it will come in handy when the thing eventually breaks on me.

I recently acquired the shell and plunger tube of a lock 'n load so I rebuilt the internals using flattened PVC pipe (sch40 for the trigger and sch80 for both both parts of the catch), and it works great. I war tested it today with surprisingly good results. Granted, the crossbow catch is a bit larger and under more stress, but I think I could get it to work after a few revisions.

I expect the catch to go before the plunger rod and I'm a bit wary of steel on plastic. Do you think the steel catch would work with the stock plunger rod?

Also, is CaptainSlug still selling the replacements? (I know this is the wrong way to go about seeking this information but I'm wary of PMing him after he posted a thread asking people not to. Though, I can't say I blame him.)
  • 0
Sex Dwarves: Drug test? What kinds of drugs are we testing?

#5 umpshaplapa

umpshaplapa

    Member

  • Members
  • 636 posts
  • Location:Atlanta, GA

Posted 22 August 2009 - 10:56 PM

Thanks for the information; it will come in handy when the thing eventually breaks on me.

I recently acquired the shell and plunger tube of a lock 'n load so I rebuilt the internals using flattened PVC pipe (sch40 for the trigger and sch80 for both both parts of the catch), and it works great. I war tested it today with surprisingly good results. Granted, the crossbow catch is a bit larger and under more stress, but I think I could get it to work after a few revisions.

I expect the catch to go before the plunger rod and I'm a bit wary of steel on plastic. Do you think the steel catch would work with the stock plunger rod?

Also, is CaptainSlug still selling the replacements? (I know this is the wrong way to go about seeking this information but I'm wary of PMing him after he posted a thread asking people not to. Though, I can't say I blame him.)

I know a guy who has a metal plunger, and it wore away the plastic catch until it misfired. Maybe he did something wrong, though.
  • 0
QUOTE(Talio @ Jun 29 2009, 01:50 PM) View Post

i got a black belt in noob banning in 2004.


#6 Soothsayer

Soothsayer

    Member

  • Members
  • 663 posts
  • Location:Cincinnati, Ohio
  • State:Ohio
  • Country:United States

Posted 23 August 2009 - 08:09 AM

Ask chilipepperfender to show you his catch, I made it and it's out of poly. It's sort of a pain in the ass, but I've made quite a few for my friends and whoever else. Not too bad a job.
  • 0

yeah I'm that guy who made that cool thing with the cool paint.



0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users