What happened?

Re: What happened?

feeds@yuku.com (iamanbk) — Sat, 28 Mar 2009 18:23:05 GMT

Same side - I tried to follow the ridge on the left side. The flake was good, and I had the end supported, but it still snapped.

Thanks,
Jeff

Re: What happened?

feeds@yuku.com (aztecstoneandflint) — Sat, 28 Mar 2009 18:17:04 GMT

Jeff, you said your second stike snapped it at the first ripple. Did you stike it from the same place as the first? Joe

Re: What happened?

feeds@yuku.com (flint hills50) — Sat, 28 Mar 2009 17:58:45 GMT

I've had the same results happen to me, holding it just as you described. That would be a fun shot on the "Time Warp" show! Craig

Re: What happened?

feeds@yuku.com (iamanbk) — Sat, 28 Mar 2009 17:50:27 GMT

I was holding it on the outside of my thigh with my leg pad curled around the far end. This was only one strike. I made a lot of gravel today!

Jeff

Re: What happened?

feeds@yuku.com (sandhillcowboy1) — Sat, 28 Mar 2009 17:44:46 GMT

Jeff,

How were you holding the spall on your first strike?

Rick

Re: What happened?

feeds@yuku.com (BOHUNTER) — Sat, 28 Mar 2009 17:29:03 GMT

Your strike was heavy to remove the ridge, the deep start only left it one place to go and that was downward. As it ran out it started down as ANY flake will do and ran out of energy. As it slowed rapidly it rippled. So just clip the other end and make one towards it and this will clean it off or feather it out!

Long piece, should be a killer inside. Try and remove as much thickness from the ends before you attack the sides.

Ive seen the technique in a lot of videos so...

Re: What happened?

feeds@yuku.com (BOHUNTER) — Sat, 28 Mar 2009 17:28:28 GMT

Re: What happened?

feeds@yuku.com (clamdigger) — Sat, 28 Mar 2009 17:18:40 GMT

i agree with bob, this has happened to me many times. you took to big a bite. also that seems to happen more often with
heated stone . IMO the energy starts to dissapate at that first ripple, it doesnt terminate in a hinge because the stone is heated,
the flake continues but the path of the flake is interupted. leaving you with ripples as opposed to a hinge fracture.

Re: What happened?

feeds@yuku.com (aztecstoneandflint) — Sat, 28 Mar 2009 17:15:35 GMT

I agree with Bob and to expand a little, you were on the verge of an overshot, where the flake wants to curve into the rock. From what it seems like you said is that you took a second stike from the same end which (if you did) would follow that first curve into the rock and, unfortunatley, complete the mission. Softer stike and or less depth/angle would prevent this. Any time you stike a wedge shaped piece ( and you did strike in the right location) the force is more chaneled, it is even...

Re: What happened?

feeds@yuku.com (knapperbob) — Sat, 28 Mar 2009 15:46:29 GMT

Jeff,
The divots appear because the billet bounces. Copper does that because of its hardness. Antler has less of a tendency to bounce but too much muscle can do the same trick. There is a limit to how far you can run a flake of a given thickness with copper before it hinges, because of the bounce.

Bob

What happened?

feeds@yuku.com (iamanbk) — Sat, 28 Mar 2009 15:22:35 GMT

This was a nice 7" Keokuk spall. I was trying for a long thinning flake. It ran to 1/2" from the end of the spall, which would have been great, except for the "waves". I was using a 1" weighted copper billet. The platform was solid and ground. The ridge ran almost to the end of the spall. Any thoughts why the divots appeared? My next hit snapped it in the divot closest to the middlr.

Thanks,
Jeff