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Search: Posts Made By: guy153
Showing results 1 to 50 of 61
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02-22-20, 05:11 AM
Replies: 68
Views: 1,566
Posted By guy153

Yes this worked for me. Just welded a bit of...

Yes this worked for me. Just welded a bit of square tube directly to the cup and then used it as a wrench. The heat from the welding probably also helps to loosen it. But just getting a decent...
02-18-20, 03:43 AM
Replies: 24
Views: 530
Posted By guy153

The clamping force on the nuts is strong enough...

The clamping force on the nuts is strong enough to hold the wheel where it is supposed to be, but the kind of dropouts you're supposed to do that with are longer. These are tiny and so if the axle...
02-17-20, 02:52 PM
Replies: 96
Views: 3,358
Posted By guy153

This is all good info and quite correct. Last...

This is all good info and quite correct. Last year it was reported in the news that someone has invented a welding rod for 7075 which may be a game-changer
...
02-16-20, 02:30 PM
Replies: 96
Views: 3,358
Posted By guy153

I agree with everyone saying this probably isn't...

I agree with everyone saying this probably isn't economical to repair by the book but you might get away with a bodge for a bit.

Speculating about the cause of the failure what's that lumpy bit on...
02-15-20, 03:18 AM
Replies: 7
Views: 273
Posted By guy153

You can find the difference in spoke length by...

You can find the difference in spoke length by using a spoke calculator-- usually one of the inputs is the offset from the centre line to the flange.

A rear wheel for a road bike will often have...
Forum: Framebuilders
02-03-20, 02:25 AM
Replies: 6
Views: 390
Posted By guy153

If you mean the kind where you heat the joint up...

If you mean the kind where you heat the joint up then touch it with the rod and it kind of sucks the filler in, that's fine for a bottle cage boss, maybe a bridge, but too weak for a main junction of...
Forum: Framebuilders
02-02-20, 02:55 PM
Replies: 6
Views: 390
Posted By guy153

A brazed joint should be as strong as a welded...

A brazed joint should be as strong as a welded one if done right. If fillet brazing you make up for the fact that the filler has less strength by making a thicker fillet. If using lugs the braze gets...
Forum: Framebuilders
02-01-20, 03:52 AM
Replies: 95
Views: 3,218
Posted By guy153

The position of the rear dropouts is the most...

The position of the rear dropouts is the most critical, in particular the angle of the axle. If one dropout is 1mm above the other, the tyre will be off by about 5mm up at the SS bridge, and if one...
Forum: Framebuilders
01-30-20, 03:01 AM
Replies: 9
Views: 330
Posted By guy153

I don't think the angle at the top is an issue....

I don't think the angle at the top is an issue. Just weld or braze it up and it will be fine.

When you buy regular dropouts they don't make different ones for different seat stay angles. You want...
01-28-20, 11:30 AM
Replies: 2
Views: 177
Posted By guy153

You could try: Put bike in workstand. Tie front...

You could try: Put bike in workstand. Tie front wheel to DT to stop it moving around (it doesn't matter if it's not lined up with the DT). Get head-tube vertical (compared to a plumb-line). Mark...
01-26-20, 02:18 PM
Replies: 66
Views: 2,214
Posted By guy153

Good question. In English the stress is either on...

Good question. In English the stress is either on the second to last syllable or the third to last, if the second to last is short (actually that's the rule for Latin, English is probably more...
Forum: Framebuilders
01-24-20, 10:41 AM
Replies: 95
Views: 3,218
Posted By guy153

I don't think steel droops over time. The...

I don't think steel droops over time. The advantage of a steel tabletop is you can drill it, tap it, weld to it etc. I will repeat what others have said that any kind of machined flat surface is a...
Forum: Framebuilders
01-21-20, 08:38 AM
Replies: 37
Views: 1,000
Posted By guy153

I meant that drawing long lengths like that...

I meant that drawing long lengths like that requires much bigger machines (and ovens for the annealing) and is therefore only economical if you have high sales volumes. Reynolds bike tubes are a...
Forum: Framebuilders
01-21-20, 07:29 AM
Replies: 37
Views: 1,000
Posted By guy153

Yes although a steel works will usually be making...

Yes although a steel works will usually be making much longer tubes, about the length of a lorry if not longer. You need to cut them up to appropriate lengths for a bike (about 600mm) before...
Forum: Framebuilders
01-21-20, 03:00 AM
Replies: 37
Views: 1,000
Posted By guy153

Possibly, but I think that involves quite a bit...

Possibly, but I think that involves quite a bit more equipment. I've seen the butting machine on YouTube and it's not much bigger than a large lathe or something like that. Then because they're heat...
Forum: Framebuilders
01-20-20, 05:20 AM
Replies: 37
Views: 1,000
Posted By guy153

Thanks for the correction. I'm not sure if...

Thanks for the correction. I'm not sure if Reynolds do anneal between butting passes but I thought the whole thing was cold right from when it was a billet. But I have looked it up and there is some...
Forum: Framebuilders
01-20-20, 12:59 AM
Replies: 37
Views: 1,000
Posted By guy153

One approach might be to try to crimp it by...

One approach might be to try to crimp it by clamping say 1.6mm or 2mm mild steel tubing against it. If that squashes before the chainstay does give up.
Forum: Framebuilders
01-19-20, 09:04 AM
Replies: 37
Views: 1,000
Posted By guy153

In the normal scheme of things everything is done...

In the normal scheme of things everything is done cold. The chainstay is tapered, drawn, bent, butted (if it is butted), all cold, starting from a solid billet in many cases, and this is considered...
Forum: Framebuilders
01-19-20, 08:06 AM
Replies: 37
Views: 1,000
Posted By guy153

Yes it's a dilly of a pickle. The 853 stays are...

Yes it's a dilly of a pickle. The 853 stays are probably the same thickness as 631 ones anyway, just unnecessarily strong and difficult to manipulate. You'd think that if it was really OK to heat...
Forum: Framebuilders
01-19-20, 12:34 AM
Replies: 37
Views: 1,000
Posted By guy153

If you improve ductility surely you destroy the...

If you improve ductility surely you destroy the heat treatment? Anyway, you could be right. They claim welding it should not reduce it to 631 according to this graph:

...
Forum: Framebuilders
01-18-20, 10:51 PM
Replies: 37
Views: 1,000
Posted By guy153

He could have got it very hot in spite of the...

He could have got it very hot in spite of the only 15cm of paint damage. In any case he will have destroyed the heat treatment, which was the idea, so he could bend it. So you now basically have a...
Forum: Framebuilders
01-16-20, 01:18 AM
Replies: 17
Views: 739
Posted By guy153

I don't understand, what triangle stickers? ...

I don't understand, what triangle stickers?

Back when 531 came out brazing was the usual way to join thin material anyway as TIG welding hadn't been invented yet. With a lot of skill you probably...
Forum: Framebuilders
01-15-20, 08:25 AM
Replies: 17
Views: 739
Posted By guy153

Yes, that's the only one that's actually thinner....

Yes, that's the only one that's actually thinner. I'm assuming they think you actually need 853 for that one (and so it's following the pattern of thinner wall and oversize to get the stiffness...
Forum: Framebuilders
01-14-20, 05:07 PM
Replies: 17
Views: 739
Posted By guy153

Yes that is the idea and they do offer some 853...

Yes that is the idea and they do offer some 853 blades that are a bit thinner. You can also get them in exactly the same dimensions as 631 or 'R' (which is presumably regular cromoly) and given that...
01-14-20, 06:48 AM
Replies: 12
Views: 468
Posted By guy153

Well done! I'd probably call that close enough at...

Well done! I'd probably call that close enough at this point (if it rides OK)
Forum: Framebuilders
01-13-20, 09:57 PM
Replies: 17
Views: 739
Posted By guy153

I suspect they didn't recommend them just because...

I suspect they didn't recommend them just because they didn't make them (presumably because of lack of demand) so recommended 631 or 725 as close alternatives.

I had a look at their catalogue and...
Forum: Framebuilders
01-13-20, 03:25 PM
Replies: 17
Views: 739
Posted By guy153

853 is the same metal as 631 only heat-treated....

853 is the same metal as 631 only heat-treated. My understanding is that this trades ductility for ultimate strength. So if they're the same gauge I would actually prefer 631 because I'd rather the...
01-13-20, 08:43 AM
Replies: 66
Views: 1,751
Posted By guy153

The frames are made in China now, not that...

The frames are made in China now, not that there's necessarily anything wrong with that, but we should be rational and look past the badge at what we're getting for our $$$ these days. Bicycle brands...
Forum: Framebuilders
01-08-20, 07:03 AM
Replies: 43
Views: 2,952
Posted By guy153

Looks really nice. The only thing I would add is...

Looks really nice. The only thing I would add is I try to put the cable stops on the tubes where they're still butted, which yours look like they probably are anyway. I arrange things so the longer...
01-06-20, 06:57 AM
Replies: 36
Views: 2,167
Posted By guy153

Two were Cromoly (Columbus Cromor and Zona), and...

Two were Cromoly (Columbus Cromor and Zona), and the most recent was Reynolds 631. Definitely going to make some more! Bike frames are quite tricky (round tubes, some tight angles, very thin wall,...
01-05-20, 04:26 AM
Replies: 36
Views: 2,167
Posted By guy153

Yes no welding on 531 and I assume the same for...

Yes no welding on 531 and I assume the same for Columbus alloys of the period, but don't know. Yes, I'm getting quite handy with the TIG and have made three frames all of which are holding up so far...
01-04-20, 02:14 PM
Replies: 2
Views: 166
Posted By guy153

Question about derailleur clutches.

The basic idea seems to be that with a clutch the cage has extra resistance against rotating counter-clockwise (as viewed from the right hand side of the bike) but rotates clockwise just the same as...
01-04-20, 04:27 AM
Replies: 36
Views: 2,167
Posted By guy153

Yes indeed, although for bike frames you often...

Yes indeed, although for bike frames you often use a mild steel rod, which is a bit weaker but more ductile. A bit weaker is OK so long as you have a little bit of thickness in the fillet.


...
12-31-19, 01:40 PM
Replies: 36
Views: 2,167
Posted By guy153

Brazing metal is about 3/4 the strength of mild...

Brazing metal is about 3/4 the strength of mild steel and about half the strength of cromoly, made up for by the thickness of the fillet. So it's pretty strong. Certainly better than epoxy. It also...
12-31-19, 04:16 AM
Replies: 113
Views: 6,201
Posted By guy153

If you look at the HT end you can see that the...

If you look at the HT end you can see that the tubes broke behind the welds, not at them as would be caused by poor penetration, so I don't think that was the problem here.

It's very hard to get...
12-30-19, 10:12 AM
Replies: 11
Views: 364
Posted By guy153

I think it'll fit pretty well. If the handlebar...

I think it'll fit pretty well. If the handlebar is too low you can just adjust that a bit with the stem.
Forum: Touring
12-29-19, 02:30 PM
Replies: 14
Views: 960
Posted By guy153

The Garmin Oregon does all those things. Will run...

The Garmin Oregon does all those things. Will run all day on a freshly charged set of AA batteries, has an optional handlebar clip and is waterproof. They've added a bunch of fitness crap and other...
Forum: Framebuilders
12-24-19, 06:15 AM
Replies: 11
Views: 654
Posted By guy153

Homemade jig, hand mitring with templates and...

Homemade jig, hand mitring with templates and aligning with bits of string, by eye, and a good back wheel work. I've also found a cheap laser level useful. Those guys also had a lot of fun with...
Forum: Framebuilders
12-24-19, 03:24 AM
Replies: 11
Views: 654
Posted By guy153

I enjoyed his videos. He also has a bunch of...

I enjoyed his videos. He also has a bunch of machine tools (because that's his main business) but you can manage without this stuff. It's not a course but you will always pick some stuff up and it's...
12-24-19, 02:44 AM
Replies: 113
Views: 6,201
Posted By guy153

These are all good points. The sledge hammer test...

These are all good points. The sledge hammer test is OK but won't find the defects that might lead to reduced fatigue life. I have seen rippling very close to the HT from crashes so it can happen....
12-24-19, 02:36 AM
Replies: 113
Views: 6,201
Posted By guy153

Is the fork pushed back though? I couldn't see...

Is the fork pushed back though? I couldn't see that in the original video. If it was then I agree with you, he must have hit something really hard.
Forum: Framebuilders
12-23-19, 10:16 AM
Replies: 36
Views: 1,908
Posted By guy153

Do you use a different filler rod for the flow...

Do you use a different filler rod for the flow pass?
Forum: Framebuilders
12-23-19, 04:39 AM
Replies: 11
Views: 654
Posted By guy153

I got started after watching Pithy Bikes...

I got started after watching Pithy Bikes (https://www.youtube.com/channel/UCqQaFLkweCgviyj_E0VEy9Q) on YouTube. Beautifully made videos and bikes, and he shows his very first frame build on there so...
12-21-19, 01:08 PM
Replies: 113
Views: 6,201
Posted By guy153

The thickness looks about right. Cromoly bike...

The thickness looks about right. Cromoly bike tubes are usually 0.8mm or 0.9mm at the ends which that probably is. The ratio you might be talking about is 50:1 diameter to wall thickness which is a...
12-20-19, 03:05 PM
Replies: 113
Views: 6,201
Posted By guy153

I think you would still get those ripples. If you...

I think you would still get those ripples. If you just weld one bike tube to another and try to break it off there's usually lots of bending before anything breaks. Actually a good test would be to...
12-20-19, 02:21 PM
Replies: 113
Views: 6,201
Posted By guy153

It's generally considered that you don't need to...

It's generally considered that you don't need to preheat when making a bike frame because the material is so thin (although you do often preheat 4130 as you say).

Agree that it's the tube that's...
12-20-19, 02:09 PM
Replies: 113
Views: 6,201
Posted By guy153

It's true that cracking open like that is...

It's true that cracking open like that is consistent with fatigue but ​​​​​​the thing is it was practically a new bike. Fatigue failures tend to appear after after several tens of thousands of km. I...
12-20-19, 04:07 AM
Replies: 113
Views: 6,201
Posted By guy153

The welds actually look really good and it's...

The welds actually look really good and it's failed in the heat affected zone just outside them with a very clean brittle fracture exactly the same on both tubes. There is some deformation of the...
12-17-19, 06:29 AM
Replies: 45
Views: 1,295
Posted By guy153

It's in compression on the major diameter but...

It's in compression on the major diameter but tension on the minor diameter. Either way it's a matter of when not if it breaks.
12-17-19, 03:10 AM
Replies: 45
Views: 1,295
Posted By guy153

I would avoid riding it except very carefully to...

I would avoid riding it except very carefully to the bike shop. If the front wheel goes there's a good chance of a fall as it's what you're using to stay upright.
Showing results 1 to 50 of 61
 


 
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