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Author Topic: A Sharps  (Read 9837 times)

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Offline Racing

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Re: A Sharps
« Reply #30 on: October 17, 2018, 06:10:40 AM »
I turned a couple of carts out of Deldrin three yrs ago. It was a failure. They crack. Need something more tensile. Have been thinking of casting 2-component silicone, the dental stuff. Will see.
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Offline Len

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Re: A Sharps
« Reply #31 on: October 17, 2018, 09:58:58 AM »

Offline prof marvel

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Re: A Sharps
« Reply #32 on: October 17, 2018, 09:39:23 PM »
The plastic 28 ga cases are nearly ideal for fit, both fitting the chamber, and holding the bullet somewhat firmly.

The brass 28 ga cases are extremely thin for use as a "rifle cartridge", and might actually need some sort of internal reinforcement sleeves.

I did try fabricating a case out of copper plumbing pipe using both self-made bases and a brass base from the plastic 28 ga case.

If one removes the movable breechplate it opens up space to add a ~ 1/8 " plate that can be milled for a rim and also act as an extractor.
My theoiry was that If one can achieve a breach seal with the cartridge, then the moveable breechplate is not as critical.
 
as mentioned, I have not tried shooting any yet.

yhs
prof marvel

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Clear this up for me will you. The breech moves up and down,how would omitting the Conant seal aid cartridge volume?

If we examine the breechblock


we can see the removable/movable gas-plate (what I previously called a breechplate)

which is unique to the sharps papercutter.

My theory is that by using a cartridge with correct chamber dimensions, we can achieve the gas seal
required, and we may not need the moveable gas-plate. By removing the gasplate we now have room
for another "loose plate spacer" that can act as an extractor .

hope that helps
prf mvl
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Offline Hawg

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Re: A Sharps
« Reply #33 on: October 17, 2018, 10:58:15 PM »
I don't know how it is on originals but to use it without the Conant seal on my repro you'd have to cut down the firing channel cone. BTW don't use petro grease to lube the block. It's a bitch to remove after firing.



Meddle not in the affairs of dragons, for thou art crunchy, and tasteth good with ketchup.

Offline Racing

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Re: A Sharps
« Reply #34 on: October 18, 2018, 08:28:34 PM »
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Offline Hawg

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Re: A Sharps
« Reply #35 on: October 18, 2018, 10:55:21 PM »
What kind of bullet does the mold throw?
Meddle not in the affairs of dragons, for thou art crunchy, and tasteth good with ketchup.

Offline Racing

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Re: A Sharps
« Reply #36 on: October 19, 2018, 04:56:38 AM »
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Offline Len

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Re: A Sharps
« Reply #37 on: October 19, 2018, 09:20:38 AM »

Offline Hawg

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Re: A Sharps
« Reply #38 on: October 19, 2018, 11:06:05 AM »
Well he did say sort of a minie  )L$ My ringtails were 490 grains.



I used paper cartridges and dip lubed them.

Meddle not in the affairs of dragons, for thou art crunchy, and tasteth good with ketchup.

Offline Len

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Re: A Sharps
« Reply #39 on: October 19, 2018, 12:51:55 PM »
Of course your bullets are heavier if you skip the hollow.
What is the idea with the smaller ring tail ???
Nice pics. The paper carts are kind of period, aren't they?

Offline Kaeto

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Re: A Sharps
« Reply #40 on: October 19, 2018, 01:19:40 PM »
The smaller ringtail was for tying the paper cart to the projectile.

Offline Hawg

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Re: A Sharps
« Reply #41 on: October 19, 2018, 02:50:33 PM »
Of course your bullets are heavier if you skip the hollow.
What is the idea with the smaller ring tail ???
Nice pics. The paper carts are kind of period, aren't they?

His aren't hollow. Like Kaeto said it's for tying to the paper cartridge. No, mine aren't period correct.
Meddle not in the affairs of dragons, for thou art crunchy, and tasteth good with ketchup.

Offline prof marvel

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Re: A Sharps
« Reply #42 on: October 20, 2018, 02:03:55 AM »
here is a link to "How I made A Tube Sight"

basically it's a brass pipe with the peep front sight and the peep rear sight attached, then adjustments are via the expensive mounts.

https://web.archive.org/web/20080610130711/http://www.lasc.us/Brennan_MakeTubeSight.htm

yhs
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Offline Racing

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Re: A Sharps
« Reply #43 on: October 20, 2018, 04:44:06 AM »
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Offline Racing

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Re: A Sharps
« Reply #44 on: October 21, 2018, 04:58:00 AM »
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