How to make a tap, to make a tool, to fix a Sheridan

[jpsgunworks]

Hi Sean. I don't know if Victor Machinery ships to Canada , but they sell 9/32 -32 taps for $9.50 . They are half way down the page.http://www.victornet.com/subdepartme...inch/1260.html

[SeanMP]

Last thing to do on this rifle was replace the pump cup.

The rubber seal itself is the same OD as a modern Benjamin 392/397 so just a simple matter of popping the old one out and popping a new one in.......

WRONG!


The bright lights at Sheridan decided to crimp the rubber seal into the steel cup with the most complicated crimping die I have ever seen.
photo_2.jpg

So a new cup had to be made to accommodate the pop in seal. I could have made it out of anything really but I chose brass.
Turn down stock to 0.765 OD
Drill a center hole with a #3 drill (tap drill for 1/4"-28)
Hollow the center of the cup to 0.600" ID to a depth of .250"
then create a lip to hold the rubber seal by opening up the ID of the cup to 0.640" out to within 0.025" of the edge.
photo_1.jpg
Part the piece off at .400" thick and then tap the remainder of the #3 hole to 1/4"-28. Then face it off to 0.375"
photo.jpg
Install the cup and button it up.

[rsterne]

OH!.... I can hear him growling now!.....

Bob

[rsterne]

I love watching a craftsman at work.... *grin*.... beautifully done, Sir!!!

Bob

[SeanMP]

Ya that's that's a bit of a pi$$er. Still would have been a toss up to do a shop made tap though as it's a one time only use item....at least I don't have any plans to do a lot of 9/32 tapping.

But thanks for the link....that looks to be a good resource and the pricing is very good.

What's more of a PITA though is 3/4 of my last post seems to have disappeared.....wth happened there I wonder.

[AirGunEric]

What's more of a PITA though is 3/4 of my last post seems to have disappeared.....wth happened there I wonder.

What are you talking about? The software shouldn't eliminate parts of posts.

[SeanMP]

Why thank ya fella's

I wasn't looking for kudo's on this one. I wanted to get some complete information published. When I went looking there was more fiction and bad information than fact. There is even a youtube video of sticking two screwdrivers down the hole and using a third as a prybar to turn the nut....In another your instructed to pound a piece of 1/8" pipe square then drill a hole in it??? After bending a 1/4" punch my feeling is that's just plain bad advice.

[AirGunEric]

? Your computer is stripping things off everything ?

[SeanMP]

Seems that way whenever I attach a lot of pictures

[SeanMP]

Here is a pic of the finished tool just before I drilled a 1/4" hole right in the center for a turning bar and then hardened the working ends
IMG_0377.jpg

Here is the cap nut freshly removed from the valve assembly. I'm not sure if it's the norm but it took everything I had to turn that nut out. The first attempt bent an ordinary 1/4 tool punch at 30 deg....Todd was a witness to the punch. I ended up hardening a piece of 1/4 drill rod to use as a turning bar.
IMG_0378.jpg

Then the tool is turned around and screwed onto the threaded stub on the valve. Wiggle and pull your guts out until the lead seals break free. And here is whats inside.

IMG_0380.jpg