building inserts

[Jerzy Sukow]

Dear All
I have just registered here. I am from Poland.
I am building new inserts now. I just got from US 440C material and start to cut it with jetsystem watercut machine. later I gonna mill it and heat-traten as this material reqiure.
1D CAD `dwg or `doc drawing are awaliable on my mail box.
I am looking for CAD `dwg drawing for CNC milling machine (prefered 40-47 centimeters crown for 100 degrees runners for 95kg competitor)
If someone has any experience to share - please mail me or post here
Regards
Jurek Sukow

[Paul Goodwin - US 46]

Jurek,

You will find that CNC will not provide enough accuracy to give the correct crown because the curve radius is too large.  CNC machines "interpolate" discrete points to approximate a curve, and you will find the crown becomes a series of small steps.  If you can't get a CAD profile with crown in it, it is ok to cut the steel flat on the  bottom and rough grind the crown by hand before heat treat.

Paul Goodwin

[Jerzy Sukow]

hello
thanks for info. I gonna mill it flat and form the crown,, lead in, out etc. after milling on sharpening machine, then heat treat.
New question: can I make plate of 60mm height instead 75? Due to it I can do 4 instead of 3 plates of one piece of material.
As I analised drawings, 38 mm down of birch an carbon, 75 mm height of plate is still not between the chock.
How do you think about it?
Regards
Jurek