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Search: Posts Made By: guy153
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02-26-20, 07:50 AM
Replies: 71
Views: 1,712
Posted By jadocs

As mentioned the stuff he points out are...

As mentioned the stuff he points out are Engineering 101 design deficiencies that should never pass muster for the prices people are paying for these brand name products. What makes it worse and the...
Forum: Framebuilders
02-24-20, 08:15 PM
Replies: 20
Views: 444
Posted By Doug Fattic

Sure, tell us about the frame in the background...

Sure, tell us about the frame in the background Andy!
02-24-20, 09:48 AM
Replies: 71
Views: 1,712
Posted By jadocs

I just recently started watching his videos. I...

I just recently started watching his videos. I have not seen them all, but everything I have seen is logical and makes sense, it's not something that is subject to interpretation. This is also not...
02-24-20, 09:20 AM
Replies: 71
Views: 1,712
Posted By smashndash

Hambini didnít. The canyon he posted was off by...

Hambini didnít. The canyon he posted was off by tenths of a mm which is lightyears when it comes to pressfit. Hereís a screenshot:

...
02-24-20, 08:36 AM
Replies: 71
Views: 1,712
Posted By WizardOfBoz

Wow, there's so many angles to this. First, I'd...

Wow, there's so many angles to this. First, I'd say that there's no set answer to "Hambini, Yes or No?". He's a young engineer, clearly bright enough, not mature enough to be introspective and...
02-18-20, 04:47 PM
Replies: 28
Views: 794
Posted By CAT7RDR

Ouch! A catheter is not exactly pain free. It's...

Ouch! A catheter is not exactly pain free. It's taking "No pain, no gain" a little too far IMHO.
02-17-20, 04:12 PM
Replies: 101
Views: 3,774
Posted By Duragrouch

OP: The problem may be not only excessive fatigue...

OP: The problem may be not only excessive fatigue loads for the frame material and near a weld zone, it may also lay in the design of the seatpost clamping slot. EDIT: I NOW SEE THAT THE CLAMPING...
02-16-20, 11:02 PM
Replies: 101
Views: 3,774
Posted By unterhausen

the seat tube was too big for the seat post, and...

the seat tube was too big for the seat post, and so it was just rocking back and forth on the clamp. Broke at the front of the seat tube/top tube juncture as demonstrated by how dirty the fracture...
Forum: Framebuilders
02-14-20, 08:15 PM
Replies: 2
Views: 217
Posted By Andrew R Stewart

Yes some can fill damaged threads with...

Yes some can fill damaged threads with brass/bronze and chase/retap. But it's best when the tap's threading matches up with the original threads. Sometimes leaving the starting thread or two void of...
02-14-20, 01:50 PM
Replies: 75
Views: 1,895
Posted By stevoo

I have run across this challenge on occasion. ...

I have run across this challenge on occasion.
Quick and easy to weld a big nut or bar etc to the cup. Then BIG wrench will remove.

Good luck
Forum: Framebuilders
02-13-20, 11:02 AM
Replies: 95
Views: 3,369
Posted By calstar

Steel plate droop?

From above in this thread:

Your Blanchard ground steel plate will droop over time and will no longer be accurate.​​​​​​

What is the source of steel plate "droop" information? It implies that a...
Forum: Framebuilders
02-12-20, 03:56 AM
Replies: 10
Views: 426
Posted By Kuromori

You can buy an endoscope camera for about $15...

You can buy an endoscope camera for about $15 nowadays, which will tell you if there was penetration in the ever important tube to tube miter area. It's possible to non-destructively see if you got...
Forum: Framebuilders
02-09-20, 07:17 AM
Replies: 6
Views: 320
Posted By Saul KK

It's zona tubing, but the thicker 8/5/8 with a...

It's zona tubing, but the thicker 8/5/8 with a 7/5/7 DT.

I capped off one end of the CS and filled it with sand. Then welded the other end shut, making sure to leave a couple of pin holes for the...
Forum: Framebuilders
02-07-20, 02:44 AM
Replies: 6
Views: 320
Posted By Saul KK

https://cimg5.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg5.ibsrv.net/gimg/bikeforums.net-vbulletin/2000x1504/img_20200205_220519_9a1eacfa1cdbb2ae4b6e2f35c115676fd9e4e493.jpg...
Forum: Framebuilders
02-05-20, 09:54 PM
Replies: 10
Views: 426
Posted By Andrew R Stewart

One reason that I suggested slicing through...

One reason that I suggested slicing through practice joints is that filler flows follow the heat. So if the inner tube to tube contact (the miter's contact) isn't up to heat the filler won't make...
Forum: Framebuilders
02-05-20, 06:20 PM
Replies: 10
Views: 426
Posted By Andrew R Stewart

The usual way is to have done enough practice and...

The usual way is to have done enough practice and slicing up to have a personal feedback loop. One starts to get a feel for amount of filler rod/wire to external build up (not that I ever get any:))...
Forum: Framebuilders
02-02-20, 07:19 PM
Replies: 6
Views: 408
Posted By Andrew R Stewart

I think you need to do some more learning about...

I think you need to do some more learning about fillers, their strengths and their weaknesses. Silver is not the usual choice for a fillet joint. The most common, 56%, can suffer from internal to the...
Forum: Framebuilders
02-01-20, 08:23 PM
Replies: 95
Views: 3,369
Posted By Doug Fattic

A bit of European and American frame building...

A bit of European and American frame building history can help explain alignment tolerances. In the 60's most framebuilders in the UK worked for low wages for whosever name was on the down tube. They...
Forum: Framebuilders
02-01-20, 09:55 AM
Replies: 7
Views: 330
Posted By Andrew R Stewart

Clearance over tires- Old school skinny was 10mm...

Clearance over tires- Old school skinny was 10mm min. Smart amount and not be too much is 15mm. This is based on the largest/widest tires the bike will ever see.
Rear attachment- Radially...
Forum: Framebuilders
01-25-20, 09:48 PM
Replies: 95
Views: 3,369
Posted By Doug Fattic

My thoughts on alignment tables. Granite tables...

My thoughts on alignment tables. Granite tables are very flat and comparatively inexpensive. Many of my students don’t choose this option because they are very heavy in the size they want and...
01-25-20, 09:23 AM
Replies: 16
Views: 710
Posted By dsaul

I'll try to answer your questions, but I feel...

I'll try to answer your questions, but I feel like your mission of a comfortable, vibration free off-road ride is misguided. Riding a bike off-road is never going to be a comfortable and vibration...
01-25-20, 07:42 AM
Replies: 16
Views: 710
Posted By dsaul

As someone who builds steel gravel bike frames as...

As someone who builds steel gravel bike frames as a hobby, I can tell you that anything shorter than 425mm is very difficult to achieve and still have clearance for wide tires and a road crankset. ...
Forum: Framebuilders
01-23-20, 06:14 AM
Replies: 95
Views: 3,369
Posted By smontanaro

And then we have this...

And then we have this (http://davesbikeblog.squarespace.com/blog/2014/12/1/the-bicycle-evolution-or-intelligent-design-part-ii.html) from Dave Moulton:My mentor, Pop Hodge, would assemble a frame,...
Forum: Framebuilders
01-22-20, 05:13 PM
Replies: 95
Views: 3,369
Posted By Andrew R Stewart

Bringheli's alignment and fork jug use a C...

Bringheli's alignment and fork jug use a C channel that's been "ground" (faced?) Bicycle frame alignment is way loose in acceptable tolerances, way sloppy. When holding a mm or two is fine the...
01-21-20, 04:30 PM
Replies: 26
Views: 684
Posted By Bill Kapaun

The slower I build wheels, the sooner I'm done. ...

The slower I build wheels, the sooner I'm done.
Tension up slower than you need to and recheck often.
"Final" truing is very minor, and I'm usually within +/- 5kgf of same side spokes.

BTW, old...
Forum: Framebuilders
01-18-20, 09:01 PM
Replies: 37
Views: 1,112
Posted By Andrew R Stewart

I'm no 853 expert but I don't know of anyone who...

I'm no 853 expert but I don't know of anyone who heats a bike tube (of any kind) before they manipulate/shape it. If the shop that did the repair will back the stays (now that they have been shaped...
Forum: Framebuilders
01-18-20, 05:10 PM
Replies: 37
Views: 1,112
Posted By molgrips

Dimpling/crimping 853 chainstays

I had new chainstays fitted to my Salsa El Mariachi - the original driveside stay was heavily gouged by chainsuck (I fitted my BB with the spacer on the wrong side!) and it snapped.

They fitted...
01-18-20, 05:01 PM
Replies: 16
Views: 681
Posted By MikeWMass

IME, wrapping top down works with thin or cloth...

IME, wrapping top down works with thin or cloth tape. I like thicker tape, and find that my hands roll up the edges of the tape when wrapped this way.
Forum: Framebuilders
01-16-20, 04:27 AM
Replies: 17
Views: 805
Posted By Kuromori

Reynolds traditionally used inverted triangle...

Reynolds traditionally used inverted triangle decals for their fork blades. They've since switched to modern decals.

Yes, brazing was typical when 531 was developed, which is why it was developed...
Forum: Framebuilders
01-15-20, 05:16 PM
Replies: 17
Views: 805
Posted By unterhausen

If you have any pointers to literature about...

If you have any pointers to literature about damping in high strength steels, I would be interested in seeing it
Forum: Framebuilders
01-15-20, 04:13 PM
Replies: 17
Views: 805
Posted By Kuromori

No strict need for 853 for MAX blades, Columbus...

No strict need for 853 for MAX blades, Columbus makes them, so does NOVA's supplier. You can make fork blades from 0.9/0.6 blanks, Reynolds just doesn't like to make blades that thin. However, if you...
01-11-20, 10:11 AM
Replies: 12
Views: 477
Posted By Andrew R Stewart

Eric's description is likely correct. Back in the...

Eric's description is likely correct. Back in the day horizontal slots would allow the wheel to sit centered by just manipulating the axle location within the slot. Now with vertical; drop outs one...
01-11-20, 07:26 AM
Replies: 12
Views: 477
Posted By unterhausen

My guess is that it was built a bit off. There...

My guess is that it was built a bit off. There probably isn't much to be gained by doing the string test. I would do it anyway (well, throw it on the alignment table). But the main fix is taking a...
Forum: Framebuilders
01-07-20, 11:29 AM
Replies: 43
Views: 3,028
Posted By Andrew R Stewart

Mike- Cable routing is an aspect that I have...

Mike- Cable routing is an aspect that I have given a lot of thought, mostly motivated by solving routing problems on factory made bikes, during servicings at the shop. I also run my rear brake on the...
Forum: Framebuilders
01-07-20, 06:34 AM
Replies: 43
Views: 3,028
Posted By mikeread

On all my bikes the rear brake cable is run under...

On all my bikes the rear brake cable is run under the TT on the left. In the UK we generally have the rear brake on the left which means that the cable always rubs the paint off the head tube. I...
01-03-20, 10:51 PM
Replies: 23
Views: 565
Posted By Andrew R Stewart

A common over time way that a rim drifts to the...

A common over time way that a rim drifts to the non drive side is that it's easier to true a wheel by pretty much only tightening the non drive side spokes. So with each annual servicing the rear rim...
01-03-20, 08:45 PM
Replies: 48
Views: 1,178
Posted By Prowler

Me too, two at a time. You'll also ensure that...

Me too, two at a time. You'll also ensure that all the nipples are turning free and smooth. This is a great to start learning wheel building. I started when I just past 60yrs. "Too old". Only in...
01-02-20, 02:27 PM
Replies: 11
Views: 413
Posted By jamesdak

I'd say a quill stem

I'd say a quill stem
Forum: Framebuilders
01-02-20, 12:29 AM
Replies: 4
Views: 546
Posted By Andrew R Stewart

Lathe Rebuild

I have this little Loosy Goosy Atlas 6" lathe, the MK2 version, that I recently got frustrated enough with when the carriage cross slide popped off it's ways as I was trying out a new and more solid...
Forum: Framebuilders
12-31-19, 12:39 PM
Replies: 43
Views: 3,028
Posted By Doug Fattic

The reason the seat tube will bulge at the lug...

The reason the seat tube will bulge at the lug shoreline is because it is not at the same temperature as the sleeve and expands more quickly. If it got hot enough it wouldn't return to its former...
12-24-19, 07:27 AM
Replies: 113
Views: 6,326
Posted By mr_bill

The fork is “bent” forward. ...

The fork is “bent” forward.

https://i.imgur.com/9WznTh2.jpg
https://i.imgur.com/MhewdOe.jpg

I know, east, west, front, back, easily confuse “experts.”

-mr. bill
Forum: Framebuilders
12-22-19, 01:47 PM
Replies: 11
Views: 742
Posted By JohnDThompson

Tubing manufacturers could supply stay ends in a...

Tubing manufacturers could supply stay ends in a variety of styles; e.g. from Tange's catalog:

http://www.os2.dhs.org/~john/stay-ends.jpg

A builder could form these from a square-cut stay end,...
Forum: Framebuilders
12-22-19, 10:49 AM
Replies: 11
Views: 742
Posted By Andrew R Stewart

I'll add a small term comment. To me a bullet end...

I'll add a small term comment. To me a bullet end treatment is when a separate and shaped (like a bullet) plug is attached to the small end of a stay and then the slot (or notch as in some TI frames)...
Forum: Framebuilders
12-20-19, 03:47 PM
Replies: 11
Views: 742
Posted By Andrew R Stewart

Stay end style is one place where a builder/brand...

Stay end style is one place where a builder/brand can create their signature, just like seat stay top caps. No doubt that there have been so many styles used over the decades. But a production shop...
12-18-19, 07:15 AM
Replies: 53
Views: 1,766
Posted By 02Giant

It's a bicycle, not an airplane. If the bike was...

It's a bicycle, not an airplane. If the bike was operating fine the last time you rode it, check the tires and go. Once a month or when you clean your ride, is fine for a detailed equipment check.
12-13-19, 11:21 AM
Replies: 14
Views: 562
Posted By HillRider

I suggest filing off that chip and using a...

I suggest filing off that chip and using a triangle file to "chase" the top couple of threads. Then see if the upper race threads on. If it does at least adequately, the stem isn't ovalized badly. ...
12-11-19, 05:07 PM
Replies: 88
Views: 5,477
Posted By FiftySix

Soma Smoothie? What kind of deal? Was it a "blem"...

Soma Smoothie? What kind of deal? Was it a "blem" sale?

Even if it wasn't, I'd build the bike and ride it. More dings and scratches will be coming that will make you forget about those little...
Forum: Framebuilders
12-09-19, 06:42 PM
Replies: 18
Views: 2,965
Posted By TiHabanero

The touring frame I built this year has a BB drop...

The touring frame I built this year has a BB drop of 9cm. I did it for two reasons, stand over height and handlebar to saddle offset. The extra 1-1.5cm in drop affords higher tire profile without...
12-06-19, 02:41 PM
Replies: 113
Views: 6,326
Posted By BFisher

That image doesn't seem to show a weld failure,...

That image doesn't seem to show a weld failure, but a tube failure just behind the weld. Maybe embrittlement? Cooling too quickly?

From millerwelds.com:
"Note that if the tubing is below 60...
09-26-19, 09:40 PM
Replies: 34
Views: 1,441
Posted By Miele Man

I just quickly made a screwdriver/nipple driver...

I just quickly made a screwdriver/nipple driver because I'm not at home.

Here it is with a spoke nipple and a spoke
...
Showing results 1 to 50 of 55
 


 
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