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Search: Posts Made By: guy153
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Forum: Framebuilders
07-25-20, 02:26 AM
Replies: 24
Views: 448
Posted By guy153

Yes my ill-fated circa 2008 Trek 520 had some...

Yes my ill-fated circa 2008 Trek 520 had some kind of schmoo holding the headbadge on. Its Chinese replacement didn't even get a headbadge, just a painted-logo of some sort. I guess if you can save a...
Forum: Framebuilders
07-17-20, 10:20 AM
Replies: 77
Views: 3,184
Posted By guy153

Looks good! Nothing wrong with looking stubby and...

Looks good! Nothing wrong with looking stubby and goofy. Interesting comment I saw in this video from about 1:47 about the idea of using aluminium for the chassis on this kind of thing:...
Forum: Framebuilders
07-15-20, 09:13 AM
Replies: 7
Views: 353
Posted By guy153

They probably don't need reaming or facing. BB...

They probably don't need reaming or facing. BB shells are thick enough that you don't get any weld-through or distortion and press fit BBs aren't relying on the outside faces for the bearing...
Forum: Framebuilders
07-09-20, 03:11 PM
Replies: 20
Views: 857
Posted By guy153

Correct, all steel will have the same ride...

Correct, all steel will have the same ride quality if the wall thickness, diameter and geometry are the same.
Forum: Framebuilders
07-08-20, 02:42 PM
Replies: 20
Views: 857
Posted By guy153

The one use-case where I think you do want a very...

The one use-case where I think you do want a very stiff frame is if you are actually racing, specifically sprinting. But most of us never do that. 1" TT and thin-wall is very well suited to riding on...
Forum: Framebuilders
07-08-20, 11:50 AM
Replies: 20
Views: 857
Posted By guy153

Agree that 9/8 DT and 1" TT will ride really nice...

Agree that 9/8 DT and 1" TT will ride really nice and be fine for power transfer and everything. I only suggested oversize because it's a gravel bike and it sort of goes with the chunkier stays you...
Forum: Framebuilders
07-08-20, 09:53 AM
Replies: 77
Views: 3,184
Posted By guy153

There's a sort of general principle/rule of thumb...

There's a sort of general principle/rule of thumb that things can get a bit too floppy if the diameter is more than 50x the wall thickness. So 2 inches and 1.2mm should be just about OK.
Forum: Framebuilders
07-07-20, 11:17 AM
Replies: 77
Views: 3,184
Posted By guy153

Is 18-gauge about 1mm in surrender units? I would...

Is 18-gauge about 1mm in surrender units? I would go with 1.6mm if it's mild steel. Also how are you welding it? 1.6mm will be easy to MIG. 1.0mm will be possible though tricky to MIG (you'll...
Forum: Framebuilders
07-07-20, 11:10 AM
Replies: 9
Views: 569
Posted By guy153

Absolute beauty of a bike!

Absolute beauty of a bike!
Forum: Framebuilders
07-06-20, 03:44 PM
Replies: 9
Views: 463
Posted By guy153

https://cimg8.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg8.ibsrv.net/gimg/bikeforums.net-vbulletin/1024x768/lsl_mtb_39295c926e97c96200263b446c29735c86e325f8.jpg
This is the "long low slack" MTB frame I made about a year ago. Columbus S-bend CS...
Forum: Framebuilders
07-06-20, 06:55 AM
Replies: 7
Views: 410
Posted By guy153

Had never heard of the Octo-Auto, people were mad...

Had never heard of the Octo-Auto, people were mad in those days!

I wonder though if by having 8 wheels rather than 4 it wouldn't legally be a "car" or subject to as many regulations 🤔
Forum: Framebuilders
07-06-20, 06:51 AM
Replies: 77
Views: 3,184
Posted By guy153

It says it's meant for a 2000lb axle so yes too...

It says it's meant for a 2000lb axle so yes too stiff. You are only planning on using one across the back though so you can halve that, and then you could remove some of the lower elements, one at a...
Forum: Framebuilders
07-06-20, 02:35 AM
Replies: 7
Views: 410
Posted By guy153

Not sure that extra wheels really makes anything...

Not sure that extra wheels really makes anything much more stable or smooth :) You could try four wheels but enormously big ones, as since this is a car you no longer have to sit on top of them....
Forum: Framebuilders
07-05-20, 10:50 AM
Replies: 15
Views: 538
Posted By guy153

It looks like they were feeding the rod from...

It looks like they were feeding the rod from inside the SS perhaps to make sure that if they saw braze on the outside all the way around (which there was) then it was a good joint. I think it was...
Forum: Framebuilders
07-05-20, 04:08 AM
Replies: 15
Views: 538
Posted By guy153

Had another look and I reckon there was about 8mm...

Had another look and I reckon there was about 8mm of braze along the top edge, and much more than that on the bottom. So I think that was a good joint. Then I noticed a bit of filler rod in the...
Forum: Framebuilders
07-05-20, 01:49 AM
Replies: 20
Views: 857
Posted By guy153

0.8/0.5/0.8 would be absolutely fine in any of...

0.8/0.5/0.8 would be absolutely fine in any of the three alloys. There isn't really any need for 853 unless you're using 0.6/0.4/0.6 on a lightweight road bike. But he won't be using that for a...
Forum: Framebuilders
07-05-20, 01:40 AM
Replies: 15
Views: 538
Posted By guy153

You can sort of see from the second picture that...

You can sort of see from the second picture that the top edge of the dropout (at the bottom of the picture) has only a few mm of attachment, basically because there's a gap between it and the inside...
Forum: Framebuilders
07-04-20, 02:23 PM
Replies: 20
Views: 857
Posted By guy153

I'm surprised that the weight and price...

I'm surprised that the weight and price differences are as big as you're being quoted. 631 is only a little bit stronger than 4130. It's just meant to respond better to welding but not by so much...
Forum: Framebuilders
07-04-20, 01:01 PM
Replies: 15
Views: 538
Posted By guy153

I found the other half of that bit I cut off: ...

I found the other half of that bit I cut off:


https://cimg0.ibsrv.net/gimg/bikeforums.net-vbulletin/816x910/cs2_894038b8e412fa81b962adcf8beaebc851c35114.jpg

A bit out of focus. In this...
Forum: Framebuilders
07-04-20, 10:40 AM
Replies: 77
Views: 3,184
Posted By guy153

I don't see why not if it's a single. If it's a...

I don't see why not if it's a single. If it's a double or a triple it might not shift gears as well the wrong way around as there all sorts of subtle ramps and bits chipped away to make that work....
Forum: Framebuilders
07-04-20, 10:32 AM
Replies: 15
Views: 538
Posted By guy153

Thanks for the comments. My assumption was that...

Thanks for the comments. My assumption was that it hadn't even been brazed at the top at all, but it is equally possible that it just didn't get that far in. At the time I cut it up (ages ago) I just...
Forum: Framebuilders
07-04-20, 05:23 AM
Replies: 15
Views: 538
Posted By guy153

Sketchy dropout attachment

This is a cross-section of the chainstay through the dropout on my old Trek 520 (circa 2008, one of the last ones to be proudly handbuilt in USA). It looks like the dropout has been shoved in and...
Forum: Framebuilders
07-04-20, 02:02 AM
Replies: 77
Views: 3,184
Posted By guy153

Anything can be a usable blueprint from a few...

Anything can be a usable blueprint from a few scribbles on an envelope up to a full CAD. The design looks fine, but no harm in making it up a bit as you go along as well.

BB shells are thick metal...
Forum: Framebuilders
07-04-20, 01:50 AM
Replies: 9
Views: 569
Posted By guy153

Have fun! Nothing beats the stoke of going for a...

Have fun! Nothing beats the stoke of going for a ride on the first frame you built.
Forum: Framebuilders
07-02-20, 02:35 PM
Replies: 77
Views: 3,184
Posted By guy153

​​​You need something that's compatible with the...

​​​You need something that's compatible with the chainset and cranks is the thing. Bottom bracket shells from bicycle tubing suppliers don't cost very much and you can get a threaded one (for much...
Forum: Framebuilders
07-01-20, 07:43 AM
Replies: 8
Views: 469
Posted By guy153

That's interesting. The only ones I offset are...

That's interesting. The only ones I offset are the seatstays where they join the ST, otherwise they would intersect each other. Never thought about offsetting chainstays or or the ST to BB.
Forum: Framebuilders
06-28-20, 02:22 AM
Replies: 77
Views: 3,184
Posted By guy153

Looks good! 60lbs is a reasonable weight I think....

Looks good! 60lbs is a reasonable weight I think. Can you get angle iron and flat iron that thin? I can only get those down to 3mm as it's all "hot-rolled". My only concern would be the two long bits...
Forum: Framebuilders
06-27-20, 03:39 AM
Replies: 12
Views: 735
Posted By guy153

This is a simple jig I made for hand-mitring. You...

This is a simple jig I made for hand-mitring. You set the angle you want by lying one arm flat on the table and using a digital angle finder box. Then you tighten that nut (the bolt is welded on the...
06-25-20, 02:36 AM
Replies: 24
Views: 993
Posted By guy153

They usually last a bit longer than that. I get a...

They usually last a bit longer than that. I get a few thousand km out of a chain and a cassette lasts three or four chains or so. I don't do a great deal of maintenance (each chain gets properly...
Forum: Framebuilders
06-25-20, 02:09 AM
Replies: 38
Views: 2,158
Posted By guy153

How about just build up the actual dropouts with...

How about just build up the actual dropouts with weld and then grind/file it to whatever shape you need for a good insertion? The dropouts are nice and thick and can take plenty of heat. And if you...
Forum: Framebuilders
06-23-20, 09:51 AM
Replies: 12
Views: 783
Posted By guy153

From the videos so far it doesn't look like Paul...

From the videos so far it doesn't look like Paul Brodie even owns my most used tool-- the humble angle grinder!

I like complete build series the most but tips and tricks videos are also good.
Forum: Framebuilders
06-22-20, 01:32 AM
Replies: 12
Views: 783
Posted By guy153

It's my new favourite YouTube channel....

It's my new favourite YouTube channel. Super-stoked to see this e-bike build. Outstanding camera work and editing as well by the way.
Forum: Framebuilders
06-21-20, 10:08 AM
Replies: 9
Views: 631
Posted By guy153

I just use a bird's nest wheel on a grinder....

I just use a bird's nest wheel on a grinder. Removes powder coat or any sort of paint in seconds but no metal.

I usually get these ones:
...
Forum: Framebuilders
06-21-20, 02:05 AM
Replies: 77
Views: 3,184
Posted By guy153

Two rails of 1x2 on edge (1/16 in wall) and then...

Two rails of 1x2 on edge (1/16 in wall) and then a few lighter cross-pieces (which you can attach seats and things to) should work well. This is how people make hot-rods (they use thicker wall but...
Forum: Framebuilders
06-20-20, 01:58 PM
Replies: 77
Views: 3,184
Posted By guy153

Yes suspension is good. But it will increase the...

Yes suspension is good. But it will increase the budget quite a bit because the springs and shocks and things are all a bit pricey. I would go with 1/16" wall mild steel tubing which will be strong...
Forum: Framebuilders
06-20-20, 01:52 PM
Replies: 12
Views: 783
Posted By guy153

Binge watch all of them, well worth it. The way...

Binge watch all of them, well worth it. The way he makes that coffee table is particularly interesting. He machines all the parts so they're perfect and then just welds them together without...
Forum: Framebuilders
06-20-20, 02:20 AM
Replies: 77
Views: 3,184
Posted By guy153

Tubing is usually better for a lightweight...

Tubing is usually better for a lightweight structure than flat bar or angle iron because it's so much better in torsion. The thinnest flat bar or angle you (normally) get here in the UK is 3mm...
Forum: Framebuilders
06-19-20, 07:38 AM
Replies: 77
Views: 3,184
Posted By guy153

How thick are your 16-gauge and 18-gauge? I think...

How thick are your 16-gauge and 18-gauge? I think American gauges may be different than UK ones (in the UK 16 gauge is about 1/16")
Forum: Framebuilders
06-19-20, 02:15 AM
Replies: 77
Views: 3,184
Posted By guy153

A project like this is in many ways easier to...

A project like this is in many ways easier to build than a regular bike frame. Thicker tubing is easier to weld. If it's mild steel you can hack it, bash it, reweld it, have lousy fitup, and make it...
Forum: Framebuilders
06-19-20, 02:03 AM
Replies: 77
Views: 3,184
Posted By guy153

Yes easily. To give you the ball-park, CroMo...

Yes easily. To give you the ball-park, CroMo tubes are about 560MPa ultimate tensile strength and mild steel is about 400MPa-- so more than half. 0.8mm wall (which is about 1/32") CrMo is commonly...
Forum: Framebuilders
06-18-20, 01:49 PM
Replies: 77
Views: 3,184
Posted By guy153

I would go with 1/16" wall if it's just mild...

I would go with 1/16" wall if it's just mild steel (and even less if it's cromoly, but cromoly is much more expensive).
Forum: Framebuilders
06-18-20, 01:46 PM
Replies: 8
Views: 442
Posted By guy153

I was welding it and it did go a little bit oval...

I was welding it and it did go a little bit oval but still averaged out to the right size and the cups went in fine. I was quite pleased because I only have a proper reamer for EC30 and was planning...
Forum: Framebuilders
06-18-20, 11:13 AM
Replies: 8
Views: 442
Posted By guy153

On the last frame but one I built I used a...

On the last frame but one I built I used a Reynolds 631 headtube with a 34mm ID for the usual 11/8 headset. It was supplied at the exact right size and didn't really need reaming. I sort of skimmed...
06-17-20, 01:40 PM
Replies: 10
Views: 625
Posted By guy153

I like the Sheldon Brown instructions but worth...

I like the Sheldon Brown instructions but worth watching this:

https://youtu.be/XUqul03hbZ8

Full disclosure I haven't watched it myself yet but intend to. Even though I have built many wheels...
Forum: Framebuilders
06-11-20, 02:39 AM
Replies: 21
Views: 991
Posted By guy153

I think you just buy a cast crown with a bit of...

I think you just buy a cast crown with a bit of an angle built into. Then the blades go straight in.

See: http://ceeway.com/NEWPARTSPAGES/Cast%20Fork%20Crowns.htm. A few of those have a 7 degree...
Forum: Framebuilders
06-05-20, 10:26 AM
Replies: 19
Views: 1,206
Posted By guy153

That's what I was thinking as soon as he started...

That's what I was thinking as soon as he started talking about machining plastic collars to go inside the seat tube :)

You could actually make an awesome pump like this. Rather than use the...
Forum: Framebuilders
05-29-20, 02:56 PM
Replies: 31
Views: 1,428
Posted By guy153

Facing the shell won't make a significant...

Facing the shell won't make a significant difference to the head angle. Headsets often differ in their lower stack height by quite a bit anyway. A 10mm difference (which is a lot) might be half a...
Forum: Framebuilders
05-16-20, 02:23 AM
Replies: 8
Views: 783
Posted By guy153

I think it's up to the builder. When I bought...

I think it's up to the builder. When I bought some 631 main tubes and 525 stays they included a "631 Main Tubes" sticker so I stuck that on. But a big manufacturer is going to have a whole box of...
Forum: Framebuilders
05-13-20, 02:53 AM
Replies: 14
Views: 869
Posted By guy153

Silicon bronze is the stuff you want. Make sure...

Silicon bronze is the stuff you want. Make sure it's a TIG rod and not one meant for a gas torch. If it's the latter it will fry and spit and try to poison you with fumes.

I use 1/16 tungsten but...
Forum: Framebuilders
05-12-20, 03:06 PM
Replies: 12
Views: 711
Posted By guy153

I wouldn't bother with JB Weld. If it looks all...

I wouldn't bother with JB Weld. If it looks all right after the paint is off use car body filler, sand it smooth and get some paint on. It's right by the crank so a less than perfect paint job will...
Showing results 1 to 50 of 188
 


 
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