Original Posted By: Doug413(at)aol.com
Subject: Pietenpol-List: Bushing Stock ???????I encountered a little booger this afternoon while fabing my upper lift strut fittings.Plans read 3/8 tubing w/18 Ga wall drilled out to 5/16. I have tried for hours to drill this out without success. Even used the creeping method by starting with smaller sized bits and they wouldn't work, just tore up more drill bits. I think I'll order some 7/16 w/ an I.D. about .307. Then ream to .3125 for a good 5/16 fit. Keep a bolt in the bushing while welding the strap fitting. I'm really asking for support on this. If one of you have encountered this problem please sound off.Corky in Icy La (Without electricity or heat for the last 4 days)________________________________________________________________________________
Pietenpol-List: Bushing Stock ???????
Re: Pietenpol-List: Bushing Stock ???????
Original Posted By: Isablcorky(at)aol.com
Subject: Re: Pietenpol-List: Bushing Stock ???????In a message dated 12/16/00 3:36:19 PM Pacific Standard Time, Isablcorky(at)aol.com writes:> > I encountered a little booger this afternoon while fabing my upper lift > strut > fittings.> Plans read 3/8 tubing w/18 Ga wall drilled out to 5/16. I have tried for > hours to drill this out without success. Even used the creeping method by > starting with smaller sized bits and they wouldn't work, just tore up more > drill bits. I think I'll order some 7/16 w/ an I.D. about .307. Then ream > to > .3125 for a good 5/16 fit. Keep a bolt in the bushing while welding the > strap > fitting. I'm really asking for support on this. If one of you have > encountered this problem please sound off.> Corky,Here is how I make those struts fittings. I have made four sets this way. I cold wrap the straps (the straps have extra length, cut to plan length later) around a 3/8 dia bar to a full pinch in the vice (some tapping is needed to shape the top portion), remove the bar, tap in the 3/8 dia tube, weld all around with my wire feed, grind excess weld to completed width of 1 inch, Dremmel excess weld in the entry of the tube to make a lead for the reamer, ream to 5/16 dia with a carbide reamer in a hand drill and the part in the vice, drill the hole in the tab per plan, deburr, paint. Hope this helps.Doug Bryant Wichita, Ks________________________________________________________________________________
Subject: Re: Pietenpol-List: Bushing Stock ???????In a message dated 12/16/00 3:36:19 PM Pacific Standard Time, Isablcorky(at)aol.com writes:> > I encountered a little booger this afternoon while fabing my upper lift > strut > fittings.> Plans read 3/8 tubing w/18 Ga wall drilled out to 5/16. I have tried for > hours to drill this out without success. Even used the creeping method by > starting with smaller sized bits and they wouldn't work, just tore up more > drill bits. I think I'll order some 7/16 w/ an I.D. about .307. Then ream > to > .3125 for a good 5/16 fit. Keep a bolt in the bushing while welding the > strap > fitting. I'm really asking for support on this. If one of you have > encountered this problem please sound off.> Corky,Here is how I make those struts fittings. I have made four sets this way. I cold wrap the straps (the straps have extra length, cut to plan length later) around a 3/8 dia bar to a full pinch in the vice (some tapping is needed to shape the top portion), remove the bar, tap in the 3/8 dia tube, weld all around with my wire feed, grind excess weld to completed width of 1 inch, Dremmel excess weld in the entry of the tube to make a lead for the reamer, ream to 5/16 dia with a carbide reamer in a hand drill and the part in the vice, drill the hole in the tab per plan, deburr, paint. Hope this helps.Doug Bryant Wichita, Ks________________________________________________________________________________
> Pietenpol-List: Bushing Stock ???????
Original Posted By: "Greg Cardinal"
Ya I have had this happen. 4130 is air hardening steel. Meaning that when it gets red hot, it hardenens easily. Really easily !The spinning drill bit ...I suspect...is heating the 4130 to a point where the inside gets hot enough to harden the steel.After that,the drill bits are drilling thru hard steel, and go to hell fast. At least I think thats the way I figure it happened to me.My plane is not a piet, so I cant vouch for the part you are working on, but I solved my problem by heating my tube red hot, then allowing it to very slowly air cool,,,by playing the heat away with the welding torch.Next I got an old drill bit, and lots of cutting fluid, and drilled with it.Next I drilled again with a new bit to size.Big pain in the ass.Bob>From: Isablcorky(at)aol.com>Reply-To: pietenpol-list(at)matronics.com>To: pietenpol-list-digest(at)matronics.com>Subject: Pietenpol-List: Bushing Stock ???????>Date: Sat, 16 Dec 2000 18:34:47 EST>>>I encountered a little booger this afternoon while fabing my upper lift >strut>fittings.>Plans read 3/8 tubing w/18 Ga wall drilled out to 5/16. I have tried for>hours to drill this out without success. Even used the creeping method by>starting with smaller sized bits and they wouldn't work, just tore up more>drill bits. I think I'll order some 7/16 w/ an I.D. about .307. Then ream >to>.3125 for a good 5/16 fit. Keep a bolt in the bushing while welding the >strap>fitting. I'm really asking for support on this. If one of you have>encountered this problem please sound off.>Corky in Icy La (Without electricity or heat for the last 4 days)>>Get your FREE download of MSN Explorer at http://explorer.msn.com________________________________________________________________________________Date: Mon, 18 Dec 2000 08:52:49 -0600
Ya I have had this happen. 4130 is air hardening steel. Meaning that when it gets red hot, it hardenens easily. Really easily !The spinning drill bit ...I suspect...is heating the 4130 to a point where the inside gets hot enough to harden the steel.After that,the drill bits are drilling thru hard steel, and go to hell fast. At least I think thats the way I figure it happened to me.My plane is not a piet, so I cant vouch for the part you are working on, but I solved my problem by heating my tube red hot, then allowing it to very slowly air cool,,,by playing the heat away with the welding torch.Next I got an old drill bit, and lots of cutting fluid, and drilled with it.Next I drilled again with a new bit to size.Big pain in the ass.Bob>From: Isablcorky(at)aol.com>Reply-To: pietenpol-list(at)matronics.com>To: pietenpol-list-digest(at)matronics.com>Subject: Pietenpol-List: Bushing Stock ???????>Date: Sat, 16 Dec 2000 18:34:47 EST>>>I encountered a little booger this afternoon while fabing my upper lift >strut>fittings.>Plans read 3/8 tubing w/18 Ga wall drilled out to 5/16. I have tried for>hours to drill this out without success. Even used the creeping method by>starting with smaller sized bits and they wouldn't work, just tore up more>drill bits. I think I'll order some 7/16 w/ an I.D. about .307. Then ream >to>.3125 for a good 5/16 fit. Keep a bolt in the bushing while welding the >strap>fitting. I'm really asking for support on this. If one of you have>encountered this problem please sound off.>Corky in Icy La (Without electricity or heat for the last 4 days)>>Get your FREE download of MSN Explorer at http://explorer.msn.com________________________________________________________________________________Date: Mon, 18 Dec 2000 08:52:49 -0600
Re: Pietenpol-List: Bushing Stock ???????
Original Posted By: Christian Bobka
Subject: Re: Pietenpol-List: Bushing Stock ???????Greg, I knew from the beginning I would have trouble with this task. Wrongly I sliced off a 1 in piece of 3/8, vised it with a 7/8 width strap of .080, tack welded the to be top of strap, heated the strap and bent it around both ways. Hammered the strap together, welded both sides, ground the weld edges to 1 in. That 4130 had hardened so much by that time IT WOULDN'T CUT. That's what happened. I'm ordering my 7/16 .307 this morning and will try again. I think it will make a neater fitting. There is no apparent reason for using 3/8 as I can see. What is the weight difference between 4 inches of 3/8 as against 7/16?Thanks for your interest.Corky in Cold La. Finally got 1 of my 2 lines of power.________________________________________________________________________________Date: Mon, 18 Dec 2000 12:24:00 -0500
Subject: Re: Pietenpol-List: Bushing Stock ???????Greg, I knew from the beginning I would have trouble with this task. Wrongly I sliced off a 1 in piece of 3/8, vised it with a 7/8 width strap of .080, tack welded the to be top of strap, heated the strap and bent it around both ways. Hammered the strap together, welded both sides, ground the weld edges to 1 in. That 4130 had hardened so much by that time IT WOULDN'T CUT. That's what happened. I'm ordering my 7/16 .307 this morning and will try again. I think it will make a neater fitting. There is no apparent reason for using 3/8 as I can see. What is the weight difference between 4 inches of 3/8 as against 7/16?Thanks for your interest.Corky in Cold La. Finally got 1 of my 2 lines of power.________________________________________________________________________________Date: Mon, 18 Dec 2000 12:24:00 -0500
Re: Pietenpol-List: Bushing Stock ???????
Original Posted By:
Corkey,If you heat whole fitting to red and cool in still air, it will bedrillable. What I do is use an old large stew pot lid. When part is red,just put the lid over it on the table and walk away. This keeps ALL draftsaway, and when cool it will be fine. Works like magic.walt---------------------------------------------------------- Original Message -----
Corkey,If you heat whole fitting to red and cool in still air, it will bedrillable. What I do is use an old large stew pot lid. When part is red,just put the lid over it on the table and walk away. This keeps ALL draftsaway, and when cool it will be fine. Works like magic.walt---------------------------------------------------------- Original Message -----
Re: Pietenpol-List: Bushing Stock ???????
Original Posted By: Christian Bobka
Re: Pietenpol-List: Bushing Stock ???????
Original Posted By: "Carl Loar"
Subject: Re: Pietenpol-List: Bushing Stock ???????Chris,I've got several of thoseCorky________________________________________________________________________________
Subject: Re: Pietenpol-List: Bushing Stock ???????Chris,I've got several of thoseCorky________________________________________________________________________________