In the field: Need to Punch (or Drill) 400+ 9/16 in Hastalloy
In the field: Need to Punch (or Drill) 400+ 9/16 in Hastalloy
(OP)
Working in the field, inside a turbine exhaust (so the work will be on scaffolding: overhead, sideways, and underfoot).
Need to punch some 400x 9/16 dia holes, each hole 33 mm from the side of a plate; plus 50x 7/8 dia holes, also 33 mm from the edge of the plate.
My planner wants me to use a hand drill - drilling a 1/4, 7/16, and finally the 9/16 holes. For the 7/8 dia holes, he wants me to use a hydraulic (Lamina) drill - which will need to be hand-clamped to the Hastalloy plate since the plate is NOT magnetic. (Weight of the Lamina and hand-punches will be about the same.)
I don't.
Due to fitup problems, some of these holes will need to be slotted as well - doubling the amount of drilling (or burring them out wih hand (Dotgo) air grinders and burr bits.)
I want to use a hand-held punch (35-45 lbs) to make the holes.
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Anybody have experience punching (small) holes in 1/4" Hastlloy plate?
Anything I need to worry about?
Any work hardening or stress cracking (later) when a punched (rather than drilled) Hastalloy plate vibrates under exhaust air dynamic loads and heat?
Need to punch some 400x 9/16 dia holes, each hole 33 mm from the side of a plate; plus 50x 7/8 dia holes, also 33 mm from the edge of the plate.
My planner wants me to use a hand drill - drilling a 1/4, 7/16, and finally the 9/16 holes. For the 7/8 dia holes, he wants me to use a hydraulic (Lamina) drill - which will need to be hand-clamped to the Hastalloy plate since the plate is NOT magnetic. (Weight of the Lamina and hand-punches will be about the same.)
I don't.
Due to fitup problems, some of these holes will need to be slotted as well - doubling the amount of drilling (or burring them out wih hand (Dotgo) air grinders and burr bits.)
I want to use a hand-held punch (35-45 lbs) to make the holes.
---
Anybody have experience punching (small) holes in 1/4" Hastlloy plate?
Anything I need to worry about?
Any work hardening or stress cracking (later) when a punched (rather than drilled) Hastalloy plate vibrates under exhaust air dynamic loads and heat?





RE: In the field: Need to Punch (or Drill) 400+ 9/16 in Hastalloy
Here's some info, don't know if it's useful to this app or not.
RE: In the field: Need to Punch (or Drill) 400+ 9/16 in Hastalloy
RE: In the field: Need to Punch (or Drill) 400+ 9/16 in Hastalloy
RE: In the field: Need to Punch (or Drill) 400+ 9/16 in Hastalloy
"Portable hydraulic c-frame punch."
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Concur with above: I need to address the worries (of my planner and back-at-the-home-office designer) about stress cracking from the hole being punched. Above link to the Haynes specification site seems to answer that : Haynes "expects" their material to be cold-punched, and does not require tempering or annealing after punch operations.
Lifting the hand-punch (hydraulic c-frame punch) overhead and aligning to the marked holes will not be simple, but it the same operations and alignment problems that I will face using the "no-longer-magnetically-based" Lamina drill that is my only other option..
RE: In the field: Need to Punch (or Drill) 400+ 9/16 in Hastalloy
RE: In the field: Need to Punch (or Drill) 400+ 9/16 in Hastalloy
RE: In the field: Need to Punch (or Drill) 400+ 9/16 in Hastalloy
If they are going to face work hardening y drilling - in addition to the "simple" problem of drilling three holes per hole x 350 holes .... Makes punching - even with the (probable) need for cleaning up the back of the punched hole with a grinder - even more attractive.
RE: In the field: Need to Punch (or Drill) 400+ 9/16 in Hastalloy
Ed Danzer
www.danzcoinc.com
www.dehyds.com
RE: In the field: Need to Punch (or Drill) 400+ 9/16 in Hastalloy