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

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Unread postAuthor: jackssmirkingrevenge » Wed Jun 01, 2011 3:21 am

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...
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Unread postAuthor: Labtecpower » Wed Jun 01, 2011 4:10 am

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.
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Unread postAuthor: jackssmirkingrevenge » Wed Jun 01, 2011 4:35 am

Labtecpower wrote:selfcontainedminipistol, how do they work?


Image

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 :oops: 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.
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Unread postAuthor: Labtecpower » Wed Jun 01, 2011 5:52 am

jackssmirkingrevenge wrote:I still don't have a lathe :oops:


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

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.
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Unread postAuthor: jackssmirkingrevenge » Wed Jun 01, 2011 6:53 am

Labtecpower wrote:I know, but I think it will be a matter of time. :D


Days, I hope!

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


Sounds sexy :D

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 ;)
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Unread postAuthor: Labtecpower » Wed Jun 01, 2011 7:02 am

jackssmirkingrevenge wrote:Sounds sexy :D


Don't use them on girlfriends, they have the tend to be very sharp :D
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Unread postAuthor: LeMaudit » Wed Jun 01, 2011 7:36 am

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 ;-)
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Unread postAuthor: jackssmirkingrevenge » Wed Jun 01, 2011 7:43 am

Image Yeah, work it! Image

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

How did you polish?
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Unread postAuthor: LeMaudit » Wed Jun 01, 2011 8:24 am

An opportunity to play with the camera :D

[youtube]http://www.youtube.com/watch?v=efZOshuJUPw[/youtube]


Look Ma'! No hands!!
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Unread postAuthor: jackssmirkingrevenge » Wed Jun 01, 2011 8:54 am

LeMaudit wrote:An opportunity to play with the camera :D


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 :D
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Unread postAuthor: LeMaudit » Wed Jun 01, 2011 8:59 am

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


Then, maybe you don't need a lathe :lol:


Did you duct tape the camera to your chin


This will remain unanswered.
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Unread postAuthor: jackssmirkingrevenge » Wed Jun 01, 2011 9:18 am

LeMaudit wrote:Then, maybe you don't need a lathe :lol:


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

This will remain unanswered


Oh, you were balancing it on something :D impressive!
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Unread postAuthor: al-xg » Wed Jun 01, 2011 9:43 am

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.
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Unread postAuthor: jackssmirkingrevenge » Wed Jun 01, 2011 9:51 am

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 ;)
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Unread postAuthor: al-xg » Wed Jun 01, 2011 10:12 am

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 ?
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