Comments on: My new frame fixture http://alexwetmore.org/archives/1177 Thu, 09 Oct 2014 15:41:30 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Alex Wetmore http://alexwetmore.org/archives/1177/comment-page-1#comment-96286 Alex Wetmore Tue, 24 Jul 2012 14:28:11 +0000 http://alexwetmore.org/?p=1177#comment-96286 Sorry, I''ve published all that I''m going to on this design. Since I copied it from a commercial design (the Arctos) I don''t really feel right giving away detailed dimensions and drawings. My photos show some more details than the ones that Arctos provide, so they do make it a little bit easier than what has already been out there. I enjoy making bicycle tooling, but have had to step back from selling it to keep up with my day job and other hobbies. Sorry, I”ve published all that I”m going to on this design. Since I copied it from a commercial design (the Arctos) I don”t really feel right giving away detailed dimensions and drawings. My photos show some more details than the ones that Arctos provide, so they do make it a little bit easier than what has already been out there.

I enjoy making bicycle tooling, but have had to step back from selling it to keep up with my day job and other hobbies.

]]> By: Adam Patterson http://alexwetmore.org/archives/1177/comment-page-1#comment-91729 Adam Patterson Tue, 26 Jun 2012 21:15:20 +0000 http://alexwetmore.org/?p=1177#comment-91729 Hello Alex, I have been searching and scouring the internet for a DIY frame jig, Yours looks to be the simplest minus the custom parts. Do you have detailed photos of the custom parts and possible the dimensions? Are you selling jigs? Would you? :) I would love more detail on the jig, I see you have a few versions of it. Thanks! Hello Alex,

I have been searching and scouring the internet for a DIY frame jig, Yours looks to be the simplest minus the custom parts.

Do you have detailed photos of the custom parts and possible the dimensions?

Are you selling jigs? Would you? :)

I would love more detail on the jig, I see you have a few versions of it.

Thanks!

]]> By: Alex Wetmore http://alexwetmore.org/archives/1177/comment-page-1#comment-84910 Alex Wetmore Tue, 17 Apr 2012 04:05:25 +0000 http://alexwetmore.org/?p=1177#comment-84910 I used the standard weight stuff, not the light weight. My jig is built with the SAE dimensioned 80/20 extrusions because it is hard to find other metric sized materials in the US. The light sections would probably be fine if that is your only option, but if you can get the heavier stuff then there isn''t too large of a downside to them. I used the standard weight stuff, not the light weight. My jig is built with the SAE dimensioned 80/20 extrusions because it is hard to find other metric sized materials in the US.

The light sections would probably be fine if that is your only option, but if you can get the heavier stuff then there isn”t too large of a downside to them.

]]> By: Theo http://alexwetmore.org/archives/1177/comment-page-1#comment-84909 Theo Tue, 17 Apr 2012 04:03:04 +0000 http://alexwetmore.org/?p=1177#comment-84909 Alex, like very much following all the stuff you are doing. Thank you for posting! Right now, I am designing "my" jig. Before I order the 80/20 stuff (actually, european 40mm profiles) I would like to know if you used just the 80/20 standard sections ( http://www.8020.net/1515-S-Pop-Up.htm ) or the light or Ultra-light sections. IMHO the load on the fixture is not very high. So I would take the light version which I can get here easily. Did you experience any deformation? Deformation after applying the heat for brazing? - Theo Alex, like very much following all the stuff you are doing. Thank you for posting!
Right now, I am designing “my” jig. Before I order the 80/20 stuff (actually, european 40mm profiles) I would like to know if you used just the 80/20 standard sections ( http://www.8020.net/1515-S-Pop-Up.htm ) or the light or Ultra-light sections. IMHO the load on the fixture is not very high. So I would take the light version which I can get here easily. Did you experience any deformation? Deformation after applying the heat for brazing? – Theo

]]> By: Grant http://alexwetmore.org/archives/1177/comment-page-1#comment-80464 Grant Sun, 18 Mar 2012 17:38:31 +0000 http://alexwetmore.org/?p=1177#comment-80464 Hello Alex, I am interested in learning to do some fillet brazing to create stems for my various bikes. Wondered if you know of any Seattle area framebuilders or metal works instructors who might offer such a class. Thanks, Grant Hello Alex,

I am interested in learning to do some fillet brazing to create stems for my various bikes. Wondered if you know of any Seattle area framebuilders or metal works instructors who might offer such a class.

Thanks, Grant

]]> By: Pete http://alexwetmore.org/archives/1177/comment-page-1#comment-75383 Pete Wed, 15 Feb 2012 16:31:50 +0000 http://alexwetmore.org/?p=1177#comment-75383 Alex, this is wonderful. I have been looking at replicating the Arctos design because it uses commonly available 8020 extrusions, and it also looks like it would be simple to modify/extend. Would you be willing to at least post a materials list (if you could include 8020 and McMaster/Carr part numbers, that would be great), and perhaps dimensional drawings of the machining that you ended up doing for the jig? I understand not having the capacity or interest to create this as a kit, but I do think there''s interest in, and a market for, a decent and reasonably priced DIY framebuilding jig. Alex, this is wonderful. I have been looking at replicating the Arctos design because it uses commonly available 8020 extrusions, and it also looks like it would be simple to modify/extend. Would you be willing to at least post a materials list (if you could include 8020 and McMaster/Carr part numbers, that would be great), and perhaps dimensional drawings of the machining that you ended up doing for the jig? I understand not having the capacity or interest to create this as a kit, but I do think there’’s interest in, and a market for, a decent and reasonably priced DIY framebuilding jig.

]]> By: Alex Wetmore http://alexwetmore.org/archives/1177/comment-page-1#comment-69262 Alex Wetmore Mon, 02 Jan 2012 04:32:35 +0000 http://alexwetmore.org/?p=1177#comment-69262 Good questions. The scribed lines for the angles were done with the CNC machine. Some of the reference lines (like the one mentioned below) were done by hand. The bottom of the head tube is located exactly at the pivot. To locate this I have a scribed line that is centered on the pivot on the side of the head tube tower. The lower cone is moved until the bottom of the head tube (or head tube lug) is square with that line. You can see a photo of this here: http://alexandchristine.smugmug.com/Bicycles/Fixtures/Arctos-Clone-Frame-Fixture/20456506_Cdbbhc#1627563704_LRQRRs8 Good questions. The scribed lines for the angles were done with the CNC machine. Some of the reference lines (like the one mentioned below) were done by hand.

The bottom of the head tube is located exactly at the pivot. To locate this I have a scribed line that is centered on the pivot on the side of the head tube tower. The lower cone is moved until the bottom of the head tube (or head tube lug) is square with that line. You can see a photo of this here:
http://alexandchristine.smugmug.com/Bicycles/Fixtures/Arctos-Clone-Frame-Fixture/20456506_Cdbbhc#1627563704_LRQRRs8

]]> By: Zip http://alexwetmore.org/archives/1177/comment-page-1#comment-69252 Zip Mon, 02 Jan 2012 02:43:55 +0000 http://alexwetmore.org/?p=1177#comment-69252 Alex: I''ve been watching your posts for the past few years from the background. Very nice work. I really like what you''ve done here. If I may, a few questions: --When you marked the angles of things on the jig, did you do that after the face with a scribe and an good angle gauge? (or did you plan ahead, and program those into your CNC pieces?) --I''m a little confused about the measurements on the head tube. Its not clear to me where the pivot is. Is the allen bolt at at the bottom of the mount? I''m confused on how you are finding out EXACTLY where the bottom of the head tube is (fore / aft, as well as up / down, relative to your datum zero. ) It looks like you get it close, then tweak up down, fore/aft to get it to match your original bike frame CAD layout. It looks like with a cone shaped HTA bottom mount, you''ve got to re-scribe reference lines for every option of Head Tube diameter. If you had used a flat bottom head tube base (perhaps with bolt in top spacers to handle a variety of head tube ID''s) AND used a two pin / curved slot virtual pivot point on the head tube set (same as the BB set up) wouldn''t you have been further ahead? Or am I missing something? Don''t mean to be critical with my comments.. You''ve got my head spinning with the work (particularly the two pin slot phantom pivot BB thing...) Very nice work. Many thanks for all your work! Zip, Metro Detroit... Alex:
I”ve been watching your posts for the past few years from the background. Very nice work. I really like what you”ve done here. If I may, a few questions:
–When you marked the angles of things on the jig, did you do that after the face with a scribe and an good angle gauge? (or did you plan ahead, and program those into your CNC pieces?)

–I”m a little confused about the measurements on the head tube. Its not clear to me where the pivot is. Is the allen bolt at at the bottom of the mount? I”m confused on how you are finding out EXACTLY where the bottom of the head tube is (fore / aft, as well as up / down, relative to your datum zero. ) It looks like you get it close, then tweak up down, fore/aft to get it to match your original bike frame CAD layout. It looks like with a cone shaped HTA bottom mount, you”ve got to re-scribe reference lines for every option of Head Tube diameter.

If you had used a flat bottom head tube base (perhaps with bolt in top spacers to handle a variety of head tube ID’’s) AND used a two pin / curved slot virtual pivot point on the head tube set (same as the BB set up) wouldn”t you have been further ahead?

Or am I missing something?

Don”t mean to be critical with my comments.. You”ve got my head spinning with the work (particularly the two pin slot phantom pivot BB thing…) Very nice work. Many thanks for all your work!

Zip,
Metro Detroit…

]]> By: Phil Brown http://alexwetmore.org/archives/1177/comment-page-1#comment-67134 Phil Brown Sun, 18 Dec 2011 17:17:36 +0000 http://alexwetmore.org/?p=1177#comment-67134 I don''t think Gary would mind. At any rate, he''s easy to contact. Email me if you don''t know how. Phil I don”t think Gary would mind. At any rate, he’’s easy to contact. Email me if you don”t know how.
Phil

]]> By: Alex Wetmore http://alexwetmore.org/archives/1177/comment-page-1#comment-66003 Alex Wetmore Mon, 12 Dec 2011 14:18:30 +0000 http://alexwetmore.org/?p=1177#comment-66003 Thanks Pat. The limited sleep wasn''t from late night machining sessions, but from going to parties Friday and Saturday nights and staying up way too late on Saturday. I did get a reasonable amount of shop time this weekend though. Thanks Pat.

The limited sleep wasn”t from late night machining sessions, but from going to parties Friday and Saturday nights and staying up way too late on Saturday. I did get a reasonable amount of shop time this weekend though.

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