SpudFiles

I am in the process of making a slightly tweaked version of sniper hero's hammer valve.

I have most parts but i have a few queries before fully assembling.

Assembled

Parts

Stem


'A' = I wish to make a piston to surround the bolt (probably out of nylon) so it is flush with the ID of the (hammer side) nipple. I have access to a lathe but i cannot find any nylon rods. Where can i get them other than Mcmaster?

'B' = I need to attach the washer to the bolt for the spring to push against but glueing it on seems a pretty scrappy method. Any suggestions?

Any overall suggestions/problems would be much appreciated.

as for A i think Grainger's or any other online parts store could help you out. we had to get some for a robot recently and we were happy with mcmaster.

as for B maybe you could weld it or something of that nature but you could also find a piece of pipe that fits over the bolt to act as like a long spacer then you could put on the washer. the spring could push the washer against the spacer holding everything in place.

for B: buy a thread cutting tool to extend the thread of the bolt to the head. Then you use two nuts to fix the washer.

M.J.P. wrote: 'B' = I need to attach the washer to the bolt for the spring to push against but glueing it on seems a pretty scrappy method. Any suggestions?

Epoxy is one of the strongest adhesives you can get your hands on. Use it.

roboman wrote:Epoxy is one of the strongest adhesives you can get your hands on.

Just don't do a "Fat Pants" and get epoxy on your hands...

(Sorry, UKSGC in-joke. )

For A, if you can't find any nylon, then try going to a plastics store to see what kind of materials you can pick up there. Delrin Acetal rod is probably one of the strongest plastics there is and usually isn't hard to find.

Thanks for all the replies.

MRR wrote:for B: buy a thread cutting tool to extend the thread of the bolt to the head. Then you use two nuts to fix the washer.

I have never used one before, are they hard to get the right pitch? I think i might go back to Bunnings and try find a bolt that already has threads further up the bolt. I also saw a 1/2 metre threaded rod with the same M6 threading so i could use that as well.

Also, good news. I was searching around my school workshop and found a piece of nylon.

Btw, when my teacher asks you, it's for my clock i'm building at school...

Before i drill the hole in the rod and chuck it on the lathe, what is a good method of centering the whole with a drill press?

Answer: don't.

Why not just use the lathe to drill the hole?

If you must use a drill press, chuck the stock in the chuck/arbor and clamp the bit.

Thread cutters aren't hard to use at all. I have to use them all the time on my high school's robotics team. They have the pitch pre set in them, they come in something like a socket wrench set. Just throw it on the rod and start twisting. You may want to practice first, though.