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Drilling into Spring steel

Discussion in 'Anything Airgun Related' started by NorfolkDave, Dec 17, 2013.

  1. NorfolkDave

    NorfolkDave Donator

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    Long story,

    Bought an ASI sniper of here, the repeater, knowing that it did not have a rear sight. Am trying to modify one of another Gamo, have cut and shaped it to length no problem using a Dremel and a cutting wheel, but I need to drill it to take the second fixing. So far I have blunted about 3 drills and have managed to grind away a small dimple. This stuff is tough as a b****rd. Any clues?

    Dave
     
  2. hawk eye

    hawk eye Banned

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    pin strike were you are going to drill and drill it at the pritty slow speed. if you drill fast you will blunt the drill bit.
    i have got some new open sights that were up for sale a while back if you intrested in themill get pics and post in a bit pall
     
  3. NorfolkDave

    NorfolkDave Donator

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    Thanks for that, but I'm determined to get this one to fit. Have spent more than it's worth so far. It's only a bit of fun though.

    Dave
     
  4. hawk eye

    hawk eye Banned

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    pin strike so the drill bit sits still and drill slow.
     
  5. ALEXON

    ALEXON Engaging Member

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    Use a drop of oil as a cutting agent, use A HSS freshly sharpened or new drill slowly as previously stated.
     
  6. ped

    ped Big Poster

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    i've used carbide masonary bits at very slow speed to drill through a chainsaw bar(very hard steel)in the past recently had to drill through some terry clips and ended up using a carbide burr in a high speed air dremel
    ped
     
  7. Prosport.22

    Prosport.22 Posting Addict

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    Remove any plastic bits, heat till cherry red then let cool, pin punch and drill. Clean, re heat dip in used engine oil to replace any bluing....:)
     
  8. stevemandm

    stevemandm Honorary Member

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    use a tin coated drill, slow speed, slow feed and with a cutting fluid/lubricant (break free is best, wd40 will do), and preferably on a mill/bench drill whilst clamped by a vice
     
  9. oliver13

    oliver13 Donator

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    You could get a diamond burr for the Dremel & use that.

    Don't bother about getting quality, just get a Rolson or Silverline for a couple of quid set off the 'Bay.
     
  10. Andy

    Andy Administrative Staff Member Founder

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    You need to use HSS Cobalt drill bits. These are made for drilling metals like stainless steel.
     
  11. sharpsman

    sharpsman Big Poster

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    What prosport said,sprung steel is as hard as hell and will ruin drill bits unless its softened.
     
  12. NorfolkDave

    NorfolkDave Donator

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    Thanks all, having another bash tomorrow.

    Dave
     
  13. airhard

    airhard Busy Member

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    Some steels won't drill and you can't return them to a softer state with heat because they never were soft, if you can get access to a spark eroder it will take a couple of minutes, a method I've used is with a arc welder, turn the welder up full but off at the wall place the end of a small rod where you want the hole and get someone to switch the welder on this should blow an hole then tidy with a grinding stone in a rotary grinder you can also do this method with a mig welder.
     
  14. NorfolkDave

    NorfolkDave Donator

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    'Kin el that sounds exciting. Used to use a spark eroder years ago for removing broken drills in crank shaft oilways, memories...
     
  15. airhard

    airhard Busy Member

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    Yes the lovely smell of paraffin, the arc rod method is very simple you can buy rods just to blow holes, pre plasma days i used arc cutting and gauging rods (stick) to cut any steels that couldn't be flam cut.
     
  16. NorfolkDave

    NorfolkDave Donator

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    Right, have tried the boring (no pun intended) stuff. Demolished some new good quality drills this morning and a couple of mini grinding burrs. Have just ordered some diamond tools for the Dremmel, this thing is getting personal now, and bloody expensive. The hole is getting bigger, but it's on a molecular scale.

    Dave
     
  17. airhard

    airhard Busy Member

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    Keep at it lol, it a pity you don't live close to me I'd pop hole in it for you, or know someone with an arc welder its about a £5 for hole cutting rods on ebay
     
  18. NorfolkDave

    NorfolkDave Donator

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    I'm keeping away from the welding kit at the moment, it's a very long time (20yrs+) since I've done any, and I wasn't very good then.

    Dave
     
  19. Deejayuu

    Deejayuu Donator

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    Sorry I'm late but if you need to thread the hole say for elevation screw. Best plan is local heat to cherry red then punch the hole with pin punch against a holed block. The funnel shape can then be tapped when cool.
     
  20. NorfolkDave

    NorfolkDave Donator

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    Good thinking that man, but it is a clearance hole.

    Dave
     

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