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Posted: Sun Oct 16, 2011 5:32 pm
by dewey-1
Here is a 6 fin variation with thinner fins.
The CP shifts dramatically with extra fins.
The M829 has 6 fins so why not yours.
Posted: Sun Oct 16, 2011 7:49 pm
by Ragnarok
jackssmirkingrevenge wrote:What I have are masonry nails, I'm not sure the Ramsets are especially harder...
Masonry nails are as hard as you're likely to need.
A misguided attempt to cut one with a hacksaw (which I've used on inch thick mild steel rod successfully) resulted in a very blunt hacksaw and a very shallow cut.
In future, a task reserved for the carbide cutting disks for my Dremel.
Posted: Sun Oct 16, 2011 10:27 pm
by jackssmirkingrevenge
al-xg wrote:Who needs a social life when you've got a lathe, eh ?
I'm tempted to agree but grudgingly acknowledge the need for
some human contact, as posted elsewhere:
jackssmirkingrevenge during his first machining project wrote:last night I had been planning on having a go at machining the pen gun body but my friends were having a drink nearby and I forced myself to join them, otherwise I am on the road to becoming the guy who sits on a bench shouting at passing busses
before the age of 65
*ahem*
Here is a 6 fin variation with thinner fins.
The CP shifts dramatically with extra fins.
The M829 has 6 fins so why not yours.
Certainly would be better supported in the barrel too, it's under a lot of stress with pressure behind it...
A misguided attempt to cut one with a hacksaw (which I've used on inch thick mild steel rod successfully) resulted in a very blunt hacksaw and a very shallow cut.
I learnt that was useless a long time ago
what I'm doing now is cutting a groove with one of my less favourite carbide tools, then clamping it in the vice and knocking the head off with a hammer - they tend to be as brittle as they are hard.
Posted: Mon Oct 17, 2011 5:15 pm
by ramses
JSR, you seem to have duplicated my results.
Posted: Mon Oct 17, 2011 10:43 pm
by jackssmirkingrevenge
ramses wrote:JSR, you seem to have duplicated my results.
Thanks for that, I
knew I had seen similar deformation on a nail but couldn't remember where
Getting older...
Admittedly although this was from a 20x hybrid, it was also a short 12" barrel and just 19mL chamber volume. Going bigger would be more power than I can justify in urban surroundings.
Really want to try out the "ramset" layout though, perhaps this weekend.