Hi Jeff, thanks for taking an interest,
Materials - I found that I couldn't drill a hole of the necessary surface finish, even in plastic. So I improvised, drilled a larger diameter hole and used a few inches of commercial airline inside the blind hole, rigid body and a polished bore.
I turned a piece of aluminium as the piston, with a waisted section for an O-ring seal and an open cup at the business end.
The compression was OK but not stunning so I fitted a cut down pneumatic blank inside the bore to give it a flat bottom. This was the state that gave some the embers, but, as mentioned - not repeatably. The most recent modification, is a thin plastic spacer (about 1/16th inch) to give a bit of clear "head room" for the tinder, I'm using char cloth by the way.
When I get it repeatable, I intend to start replacing items one-by-one, hopefully maintaining the performance, until I get an all natural example.
What are your thoughts?
Cheers
Ogri the trog
Materials - I found that I couldn't drill a hole of the necessary surface finish, even in plastic. So I improvised, drilled a larger diameter hole and used a few inches of commercial airline inside the blind hole, rigid body and a polished bore.
I turned a piece of aluminium as the piston, with a waisted section for an O-ring seal and an open cup at the business end.
The compression was OK but not stunning so I fitted a cut down pneumatic blank inside the bore to give it a flat bottom. This was the state that gave some the embers, but, as mentioned - not repeatably. The most recent modification, is a thin plastic spacer (about 1/16th inch) to give a bit of clear "head room" for the tinder, I'm using char cloth by the way.
When I get it repeatable, I intend to start replacing items one-by-one, hopefully maintaining the performance, until I get an all natural example.
What are your thoughts?
Cheers
Ogri the trog