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How do you accurately pinpoint TDC

gknaka2
On a curved receiver with limited tools?
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Comments

7 comments

Date Votes
  • 260
    measure out to out and divide by 2
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  • rufe-snow
    If the sides of the receiver are flat? Place the flat surfaces of the receiver on a flat surface, like a sheet of glass. Coat the top rounded surface of the receiver with a black sharpie pen. Make a scriber out of a sharpened nail. Attach it to a block of wood. Flip the receiver from one side to the other until until the mark the sharpened nail makes is centered. Of course your going to have to shim the block of wood that the nail is attached to, by trial and error until the mark is centered on the receiver.
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  • gunnut505
    Put adhesive tape across curved part, mark edges.
    Remove tape & place on flat surface.
    Measure across & divide by 2 & make a mark on the tape.
    Re-install tape with edges being already marked; Viola!
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  • gknaka2
    thank you all. Brownells sells a TDC punch but I dont feel like shelling out $50 for 6 holes.
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  • nononsense
    gknaka2,

    Are you trying to locate the holes for drilling and tapping scope bases?

    Best.
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  • tsr1965
    In theory, if the sides of the reciever are parallel, a small square should ride the top of the radiused reciever.

    Best
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  • gknaka2
    quote:Originally posted by nononsense
    gknaka2,

    Are you trying to locate the holes for drilling and tapping scope bases?

    Best.




    Correct. I drill and tap my own receivers and until now, usually use 2 wood blocks in conjunction with my dial calipers and a spring loaded center punch. I am not comfortable using this method any longer and wanted to hear some ideas, many of which are very good. For simplicity sake, I do like the tape idea, especially since I have the dial calipers that can make it very accurate.
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