JSR wants a lathe/mill thread -> JSR buys Sherline

[jackssmirkingrevenge]

Been doodling some designs and seeking consultation as to what tools I would need to purchase exactly for my purposes and what is and isn't possbile with a lathe and mill. Here's one, not saying I'll build it but the list of potential projects is growing by the day...

[Labtecpower]

selfcontainedminipistol, how do they work?

I don't completely get the piston.

Do you have looked for some reamers to use with your lathe? I drilled a hole yesterday on a lathe with a brand new 8 mm drill. It was pretty rough on the inside, too rough for pistons or O-rings.

[jackssmirkingrevenge]

selfcontainedminipistol, how do they work?

I don't completely get the piston.

The dark grey part through the front is a rod so air is free to flow around it.

Do you have looked for some reamers to use with your lathe? I drilled a hole yesterday on a lathe with a brand new 8 mm drill. It was pretty rough on the inside, too rough for pistons or O-rings.

I still don't have a lathe what I do have is the money burning a hole in my pocket and the increasing knowledge that I need to be better informed before I part with my cash. My consultant assures me it will be fine in brass, though I have yet to see the full operation in action. Note that in this case the o-ring on the piston seals agains the breech, but there is no seal in contact with the chamber walls.

[Labtecpower]

I still don't have a lathe

I know, but I think it will be a matter of time.

And, it's good to know what tools are around, so you can spend your money on the right one.
You can get adjustable reamers, so you can use one for multiple sizes.

[jackssmirkingrevenge]

I know, but I think it will be a matter of time.

Days, I hope!

You can get adjustable reamers, so you can use one for multiple sizes.

Sounds sexy

In the meantime, I noticed that the port between pump and chamber needs a hole that will then be plugged with a brass rod epoxied in place

[Labtecpower]

Sounds sexy

Don't use them on girlfriends, they have the tend to be very sharp

[LeMaudit]

it will be fine in brass, though I have yet to see the full operation in action.

Here's for you 5/16" hole, just to feel it (very quick & dirty job)
But it is very true a reamer would do a better job... you never have enough tools

[jackssmirkingrevenge]

Yeah, work it!

To be honest, even drill only looks good enough for piston purposes...

How did you polish?

[LeMaudit]

An opportunity to play with the camera

[youtube][/youtube]


Look Ma'! No hands!!

[jackssmirkingrevenge]

An opportunity to play with the camera

Much better than your previous effort and oh, that complex eh? I already polish like that in my drill-clamped-in-a-vice lathe!

Look Ma'! No hands!!

Did you duct tape the camera to your chin

[LeMaudit]

I already polish like that in my drill-clamped-in-a-vice lathe!

Then, maybe you don't need a lathe

Did you duct tape the camera to your chin

This will remain unanswered.

[jackssmirkingrevenge]

Then, maybe you don't need a lathe

I think it's gone beyond "want" at this point!

This will remain unanswered

Oh, you were balancing it on something impressive!

[al-xg]

No hammer and sear
No conical seat
No fold down grip for easier higher pressure pumping
No air inlet for the pump
No spring to prevent air from leaking into the chamber instead of pilot volume :O


Actually that reminds me that some largish bore HPA pistol is something I've wanted to do for a while.

[jackssmirkingrevenge]

The pretty textures were meant to distract you!

No air inlet for the pump

Floating o-ring

No spring to prevent air from leaking into the chamber instead of pilot volume

Pulling the trigger fully sufficiently blocks off the port

[al-xg]

Mmhmm and how does it get to the O-ring in the first place ? Loose fitting pump shaft ?

Pulling the trigger fully sufficiently blocks off the port

And the pin moves back with pressure on first pump stroke ?