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21. Re: [TowerTalk] Mast slippage (score: 1): Author: john@kk9a.com; Date: Wed, 29 Jul 2020 10:22:08 -0500; Plus some of the tower cross braces may be in the way of the large drill base since the mast is inside the tower. You also need to carry up hundred plus feet of heavy-duty extensions cord. I would no; /archives//html/Towertalk/2020-07/msg00381.html (9,104 bytes)
22. [TowerTalk] mast slippage (score: 1): Author: Kim <whensley11@comcast.net>; Date: Wed, 29 Jul 2020 10:50:02 -0500 (CDT); In drilling through my mast... I used a LOW speed setting, plus lots of cutting oil, and it went through like butter. FWIW. 73, Kim - WG8S _______________________________________________ ____________; /archives//html/Towertalk/2020-07/msg00383.html (7,832 bytes)
23. Re: [TowerTalk] Mast slippage (score: 1): Author: Mac <libbysales@austin.rr.com>; Date: Wed, 29 Jul 2020 15:53:42 -0500; Ah ! i have done this and i will add with great success, AND my mast was 1/2" Chromoly 2" od and obviously then 1" id after drilling the hole i didn't use a bolt but rather a 1/2" spring pin or rol; /archives//html/Towertalk/2020-07/msg00389.html (10,439 bytes)
24. Re: [TowerTalk] Mast slippage (score: 1): Author: Charles Gallo <charlie@thegallos.com>; Date: Wed, 29 Jul 2020 18:03:10 -0400; Cast Iron is interesting If you get good grade cast iron, it machines like butter If it is cooled rapidly, you get what they call chilled cast iron, which can be amazingly hard, like you either must; /archives//html/Towertalk/2020-07/msg00390.html (10,145 bytes)
25. Re: [TowerTalk] Mast slippage (score: 1): Author: Robert Harmon <k6uj@pacbell.net>; Date: Wed, 29 Jul 2020 15:56:56 -0700; I spent way too much time dealing with this issue with my Orion 2800 rotator. I finally bought of these K7NV mast clamps and never had a problem since. He makes these for his prop pitch rotators and; /archives//html/Towertalk/2020-07/msg00391.html (11,701 bytes)
26. Re: [TowerTalk] Mast slippage (score: 1): Author: Wes <wes_n7ws@triconet.org>; Date: Wed, 29 Jul 2020 16:27:15 -0700; In my youth I spent some time working in the automotive machine shop that my dad ran. Disk brakes were unheard of then, so everything was drums. (I'm dating myself).. In addition to the asbestos du; /archives//html/Towertalk/2020-07/msg00393.html (10,511 bytes)
27. Re: [TowerTalk] Mast slippage (score: 1): Author: "Les Brown" <lesbrown@sympatico.ca>; Date: Fri, 31 Jul 2020 00:55:48 -0400; Thanks for all the advice guys. I think I'll start with replacing the SS M8 bolts with 3/8 inch grade 8 bolts (or grade 9 or 10?) to see if that solves the problem. If it doesn't, I'll have to try th; /archives//html/Towertalk/2020-07/msg00406.html (13,665 bytes)
28. Re: [TowerTalk] Mast slippage (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Fri, 31 Jul 2020 08:52:40 -0700; If you stay with metric bolts the grade 10.9 is the same as gr8 SAE. 150ksi tensile strength, 2x 18-8 SS. Use the correct washers and nuts. Grade 9 is only 20% higher and more expensive. Plenty of to; /archives//html/Towertalk/2020-07/msg00411.html (13,855 bytes)
29. Re: [TowerTalk] Mast slippage (score: 1): Author: john@kk9a.com; Date: Fri, 31 Jul 2020 11:36:35 -0500; Will 3/8 bolts fit into a plate designed for M8? I believe that stainless steel bolts are typically not much stronger than grade 2. Grade 8 bolts are available with Armor Coat which has great corrosi; /archives//html/Towertalk/2020-07/msg00412.html (8,570 bytes)
30. Re: [TowerTalk] Mast slippage (score: 1): Author: Jon Pearl - W4ABC <jonpearl@tampabay.rr.com>; Date: Fri, 31 Jul 2020 17:20:38 -0400; Hi John, 3/8" is a tad fat for the M8 hole. 5/16" = .3125" and will drop in a M8/.3149" hole 3/8" = .3750" and will drop in a M10/.3937" hole 73, Jon Pearl - W4ABC On 7/31/2020 12:36 PM, john@kk9a.co; /archives//html/Towertalk/2020-07/msg00415.html (9,474 bytes)
31. Re: [TowerTalk] Mast slippage (score: 1): Author: Charles Gallo <charlie@thegallos.com>; Date: Fri, 31 Jul 2020 17:53:58 -0400; Indeed, 304 stainless bolts are roughly the same shear strength as grade 2. That said, through shoulder, single sliding shear is about 4900 lbs. Do you really need more than that? Sometimes as hams,; /archives//html/Towertalk/2020-07/msg00416.html (9,815 bytes)
32. Re: [TowerTalk] Mast slippage (score: 1): Author: <john@kk9a.com>; Date: Fri, 31 Jul 2020 19:18:10 -0400; WE3NNT is not pinning the mast with the grade 8 bolts, I think some towertalk posts scared him away from drilling though 4130 tubing. He is just replacing the M8 stainless steel clamp bolts. John KK9; /archives//html/Towertalk/2020-07/msg00417.html (10,568 bytes)
33. Re: [TowerTalk] Mast slippage (score: 1): Author: <john@kk9a.com>; Date: Fri, 31 Jul 2020 19:18:22 -0400; The bracket's hole size was never mentioned in the VE3NNT's post. I thought it was odd that he was going up a size so I questioned if 3/8 will fit. John KK9A Hi John, 3/8" is a tad fat for the M8 hol; /archives//html/Towertalk/2020-07/msg00418.html (10,215 bytes)
34. Re: [TowerTalk] Mast slippage (score: 1): Author: "Les Brown" <lesbrown@sympatico.ca>; Date: Fri, 31 Jul 2020 21:50:15 -0400; I was wondering about the size of the holes in the rotor mast clamp. I didn't measure them to see if there was any slop. I know that 3/8 inch is a little larger than M8. I was worried though that a 5; /archives//html/Towertalk/2020-07/msg00420.html (11,307 bytes)
35. Re: [TowerTalk] Mast slippage (score: 1): Author: "Hector Garcia,XE2K" <j_hector_garcia@sbcglobal.net>; Date: Tue, 4 Aug 2020 15:10:40 +0000 (UTC); LesThis is what you need to solve the problem5 new photos by Hector XE2K Garcia 5 new photos by Hector XE2K Garcia K7NV make this , the antenna you see is a JK Phantom 48ft boom J.Hector Garcia XE2K; /archives//html/Towertalk/2020-08/msg00012.html (8,251 bytes)
36. Re: [TowerTalk] Mast slippage (score: 1): Author: "Hector Garcia,XE2K" <j_hector_garcia@sbcglobal.net>; Date: Tue, 4 Aug 2020 18:20:57 +0000 (UTC); maybe this link will work https://photos.google.com/share/AF1QipMlrvcko6nC_bbEGKmMvrbuAiI0zXSx1n0MeO429JvZ_1-l9u8s0PYXhwb2PsSD8Q?key=aVJtbXZCaXJ6RlYxS3VvcjdpdngxYVF3RGg3TURR J.Hector Garcia XE2K / A; /archives//html/Towertalk/2020-08/msg00013.html (9,447 bytes)
37. Re: [TowerTalk] Mast slippage (score: 1): Author: "Les Brown" <lesbrown@sympatico.ca>; Date: Wed, 26 May 2021 21:06:25 -0400; Hi guys, Last year, I reported mast slippage with my PST-71D clamshell mast clamp. Well, after replacing the clamshell clamp with the nice K7NV 3 inch mast clamp, no more mast slippage. However, the; /archives//html/Towertalk/2021-05/msg00151.html (11,025 bytes)
38. Re: [TowerTalk] Mast slippage (score: 1): Author: David Gilbert <ab7echo@gmail.com>; Date: Wed, 26 May 2021 19:28:04 -0700; Are you certain that what you are seeing isn't simply torsional twisting of the mast itself? I have a 20 foot 2 inch diameter chromoly mast with 5 feet inside the tower, an Optibeam OB16-3 about 3 f; /archives//html/Towertalk/2021-05/msg00152.html (8,796 bytes)
39. Re: [TowerTalk] Mast slippage (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Wed, 26 May 2021 20:08:52 -0700; The minor diameters of both 5/16-24 and M8x1 are within 1% of each other, so the area resisting tension is the same. Grade 8 tensile strength 150,000 psi. 18-8 SS 70,000 psi so a simple comparison is; /archives//html/Towertalk/2021-05/msg00153.html (12,714 bytes)
40. Re: [TowerTalk] Mast slippage (score: 1): Author: k7lxc--- via TowerTalk <towertalk@contesting.com>; Date: Fri, 28 May 2021 14:25:47 +0000 (UTC); _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk; /archives//html/Towertalk/2021-05/msg00174.html (8,930 bytes)

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