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  • Making a Reamer

    I am going to try making a single point reamer.
    This will be a chambering reamer for rifle barrel, so it will be a piloted reamer.
    Two questions, what is everyones favorite steel for this use?
    After turning the shape, it is cut down to EXACTLY half diameter, right?

    TIA

    Jim

  • #2
    Jim
    You are a braver man than me, for the time and expense I would just as soon get a Clymer and get it over with.

    www.clymertool.com

    If you still want to try it yourself T-15 or M-42 would be good choices and make a much tougher tool (professional harden & temper). O-1 if you want to harden yourself, A-2 is you have access to a controlled atmoshpere hardening furnace. The NRA may have some suggestins as to geometry. They are not easy to go right.

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    • #3
      O1 heat w/ torch in drill press @ +/- 200 rpm.,...bring up x/mission fluid & quench while running .......use a tool post grndr to take out the usual.010 +/- warp & grind down to 1/2 + about .010 for slight neg rake ...because of pilot size vs other diameters there is warp ...spinning evens heat & vertical quench gives least change.. !..made A 32/35 STEVENS 1/2 REAMER & halved it first...result , a banana...still have it to remind me not to do it again...have made barrel center 1/2 reamers,grinding before hardening & gotten away w/ it..... .may get by w/ straight case ,but then, u can just bore it!!!fluted reamers not much more trouble to make........little fixture can be cobbled up in 1/2 day to hold in milling vise....have made several sets..22/250 , 257 roberts imp. etc......clamp a sin bar to toolpost & indicate from t/stock for correct diff. in rolls w/ compound set up near correct angle, for shldr angle ..great article in village press mag made my life easier( dean johnson ????)...but for urself , if u miss the angle , just hdspace it correctly & u have ur own wildcat blitxen-boomer mag,(shoulder will blow out to size)....if u want to get into fluted reamers ,i made up some instructions (for myself), after last set,cause i went crazy trying to remember my set up 5 yrs earlier ,& could probably still find them ....master machinist once told me a customer came in w. some plans ...he looked at them & said ....cant do it on my machines......customer said ,u did 11 yrs ago ......old machinist said it took him 4 days to remember /figure out ,how he did it & 1 day to do it!!!!big problem w/ hsm's is one off items ,.....if its adequate ,u dont make it better ,& dont repeat enuf to gain speed & long term memory..

      I DID IT MY WAY!...therein lies the satisfaction ,the money is the least part....& yeah , u dont really want to let loose of a c note for an experimental reamer that may need a 1/2 dozen revisions before giving up & settling on a factory crtrdg..keep in touch
      best wishes
      docn8as
      docn8as

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      • #4
        You can rent reamers and headspace gages from www.reamerrentals.com. I have used them with good success.
        I would still like to make my own sometime.
        Jim H.

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        • #5
          Jim....just looked at my earlier post.....main reason for grinding 1/2 reamer AFTER hardening is ,the x/sectional variance is the principal cause of the warpage ....can easily be .020 out when put back on center & checked!..a straight dowel of full x/section would be out very little w/ O1
          best wishes
          docn8as
          PS 01 drawn at 375 in the oven for an hour is around R 61-62,..has surprising give ...can actually see it twist before fracturing.....ask me how i know!......cut two chambers & four dies & still felt as sharp on finger tip as at beginning...for production use , hi speed /carbide indicated , but out of hsm league...
          docn8as

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          • #6
            fwiw....if anyone is tired of headspacing on cases , & too cheap to buy gages , both rimmed & (rimless gages if u have access to datum line info)are easy to make w/out having to set up shlder angle . let me know if interested.
            best wishes
            docn8as
            docn8as

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            • #7
              Thanks all for the support

              I know about renting reamers but what I want to use is the latest 17 caliber rimfire- I called JGS and asked about one

              $179 ! ! and it is too new for the rental shops to have any.

              As the body of the case is about 1/4" diameter, I may give serious consideration to grinding after hardnening- even tho I will have to grind it free-hand

              Thanks again

              Jim

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              • #8
                If you freehand grind it, remember to leave it .002-3" over half, then stone the edge. Should leave it just about right after stoning. If it's exactly half dia, it will grab. I'd also make a test piece with the proper diameter hole for the pilot, to get a feel for how it cuts, and make a chamber cast to see what you get.

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                • #9
                  If you can get a copy of "Advanced Gunsmithing" by W. F. Vickery you will find in it complete instructions for the construction of half reamers.

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                  • #10
                    Jim
                    Does Hornady have ammo out for it yet? Read about it in National Rifleman.

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                    • #11
                      Thrud:
                      Yep: I picked up a box at a gun show last weekend-

                      $11.50 / box of 50 =:-0

                      Same show I found a Ruger Single Six in 22 mag, greatly used, for little money.

                      I have a take-off 17 barrel, now all I need is the reamer and I will have Ruger six-shooter for the new cartrige.

                      ( Right after I finish converting a Ruger Blackhawk to 218 Bee ;-) )

                      Tinker Jim

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                      • #12
                        Jim
                        should be a nice little gun when she's done - Sweet! (both of them) Ammo price scares me though. That is 24 clams here, you can reload centerfire .17 cheaper! Hell, I can almost reload .50BMG cheaper ;-) ! Ok, maybe only 6 or 7 rounds, but they are a hell of a lot more F-U-N. Them gophers can run, but they can't hide anywhere...



                        [This message has been edited by Thrud (edited 04-27-2002).]

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                        • #13
                          THRUD: With your sense of humor I figure that you must be the crazy Canadian that I went through USMC boot camp with in 1958. WALT WARREN

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                          • #14
                            Jim ...go for it .put a mashburn bee on that ruger while ur at it ....better shoulder better looking & +150 f/s in a 24 in barrel

                            best wishes
                            docn8as
                            docn8as

                            Comment


                            • #15
                              Jim ....alwys wanted to put a .222rem rimmed on a winchester lo wall single shot .could handload & keep pressures below 45,000...bought a hundred aussie cases,& didnt get any further...30 yrs later ,think it is still a good idea ...point is, smaller case head area of .222R rimmed translates to less back thrust than bee, & mashburn arms used to put his improved bee on lo walls ..remember seeing one in the fifty's ...wonder how it would work in ruger?

                              best wishes
                              docn8as
                              docn8as

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