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Search: Posts Made By: jccaclimber
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08-10-22, 12:21 AM
Replies: 1
Views: 90
Posted By jccaclimber

It takes more torque to overcome static friction...

It takes more torque to overcome static friction and get them turning than it does to keep them turning. The fact that they did not move the second time implies you did not rise to the final torque.
08-07-22, 05:39 PM
Replies: 7
Views: 237
Posted By jccaclimber

Top photo to the cup, bottom photo to the...

Top photo to the cup, bottom photo to the cone/spindle, though the video one post up explains why very nicely.
08-07-22, 10:50 AM
Replies: 20
Views: 425
Posted By jccaclimber

Yes, but cantilevered. Same concept but I was...

Yes, but cantilevered. Same concept but I was trying to imply the plate going through both ends, and the measurement point kept between them.
With many of these, the perpendicular itís of that...
08-06-22, 10:22 PM
Replies: 20
Views: 425
Posted By jccaclimber

If you screw a flat plate in the place of the...

If you screw a flat plate in the place of the inner cage you should get a decent surface. Don't feel bad making it thicker than the original plate, that just means you'll need longer screws.
08-06-22, 02:17 PM
Replies: 20
Views: 425
Posted By jccaclimber

Yet another ďone more noteĒ. I also found more...

Yet another ďone more noteĒ. I also found more variability in position than I wanted as I was setting up my experiment, and concluded making sure everything in the shifter was seated would help.
...
08-06-22, 02:08 PM
Replies: 20
Views: 425
Posted By jccaclimber

One more note, it looks like my first pass at...

One more note, it looks like my first pass at determining cable pull per shift was repeatable within +/- 0.05 mm (0.002") across 5 runs. The instrument I was using has sub micron repeatability, so...
08-06-22, 01:29 PM
Replies: 20
Views: 425
Posted By jccaclimber

Just yesterday I approved a PPAP for a high...

Just yesterday I approved a PPAP for a high volume part with a Cpk > 5 on a 0.008 mm wide tolerance band. Admittedly that's the highest Cpk I've actually seen in the wild, but if you understand the...
08-06-22, 11:57 AM
Replies: 20
Views: 425
Posted By jccaclimber

While youíre at it you might as well reject the...

While youíre at it you might as well reject the results for not using instrumentation with a current NIST traceable calibration and operating in a temperature and humidity controlled environment.
08-05-22, 10:42 PM
Replies: 20
Views: 425
Posted By jccaclimber

I'll have to find the data, but I did a similar...

I'll have to find the data, but I did a similar thing with Shimano 10sp front shifter. Mostly putting this here as a reminder, it's about time to go back to trying to convert my front shifter from a...
Forum: Introductions
08-05-22, 01:59 PM
Replies: 25
Views: 511
Posted By jccaclimber

It might help and I highly doubt that it will...

It might help and I highly doubt that it will hurt. Do give it a bit of longer lasting lubricant after.
My guess is that you have a worn out spring or detent, but it is truly amazing what refreshing...
Forum: Introductions
08-04-22, 01:18 AM
Replies: 25
Views: 511
Posted By jccaclimber

Given the age of those shifters I wouldnít be at...

Given the age of those shifters I wouldnít be at all surprised if itís just friction and detents.
08-03-22, 03:59 PM
Replies: 6
Views: 232
Posted By jccaclimber

If they donít have it on their web page, donít...

If they donít have it on their web page, donít reply to your email, and you wonít call them or have your riding partner(s) call them, what options do you see even if they do rent bikes?

Also,...
08-01-22, 08:49 PM
Replies: 23
Views: 589
Posted By jccaclimber

Iíve personally seen a rear (external cam) QR...

Iíve personally seen a rear (external cam) QR shoved open mid ride. Exactly as described above. Two I experienced riders in close formation. Front one slowed suddenly for a car. Rear rider overlapped...
08-01-22, 01:33 AM
Replies: 23
Views: 545
Posted By jccaclimber

Iíve been successful in using DIY tools like the...

Iíve been successful in using DIY tools like the one youíve described. Itís the downside of having a mill and wanting things done now. The important piece of information in this case is that...
07-30-22, 02:08 AM
Replies: 29
Views: 736
Posted By jccaclimber

Thin enough to still flow through the crack. ...

Thin enough to still flow through the crack.
Non drying so it will leave evidence.
Non corrosive in case the frame isnít toast.
As an added bonus, surface tension wonít keep it from getting...
Forum: Introductions
07-28-22, 01:14 AM
Replies: 25
Views: 511
Posted By jccaclimber

I misinterpreted, thatís even older than I was...

I misinterpreted, thatís even older than I was picturing. Thatís definitely a parts bin item, or equivalent. It could also just be a bent derailer hanger or something else similarly easy to fix. The...
Forum: Introductions
07-27-22, 06:42 PM
Replies: 25
Views: 511
Posted By jccaclimber

The STI road shifters are a real bear to work...

The STI road shifters are a real bear to work inside of. The MTB ones, at least up to a few years ago, actually arenít too bad, though some of them have a tiny spring that goes flying when you open...
Forum: Introductions
07-27-22, 05:35 PM
Replies: 25
Views: 511
Posted By jccaclimber

No shortage of bicycle co-OPís/bike kitchen sorts...

No shortage of bicycle co-OPís/bike kitchen sorts of places in SFBay. Many have fairly deep parts bins of older products and decent mechanical knowledge. One of them is likely the cheapest solution...
07-27-22, 05:31 PM
Replies: 6
Views: 161
Posted By jccaclimber

It sounds like something wasnít built right when...

It sounds like something wasnít built right when it came into your hands.
It sure sounds like something is damaged beyond repair, though a picture would say a lot more. A few ďHelloĒ replies in...
07-27-22, 05:27 PM
Replies: 9
Views: 451
Posted By jccaclimber

1. If you disconnect the brake cable while the...

1. If you disconnect the brake cable while the wheel is installed does the drum still drag?
2. Is the backing plate rigidly held, or does it wobble around a bit when the wheel is installed?
3. Is...
07-25-22, 08:35 PM
Replies: 6
Views: 480
Posted By jccaclimber

I consider myself pretty good with my hands, but...

I consider myself pretty good with my hands, but other than the first time, it typically takes me a bit under an hour to pack. I'll bet I could get unpacking under 30 minutes if I tried hard, and I...
07-25-22, 08:19 PM
Replies: 26
Views: 782
Posted By jccaclimber

This is a reflection on that article, not you,...

This is a reflection on that article, not you, but that's article seems to have been written in a way to almost deliberately confuse the inexperienced. It shows (and links a reference to) a bolt on...
07-25-22, 04:08 PM
Replies: 23
Views: 561
Posted By jccaclimber

This sounds an awful lot like a stripped thread....

This sounds an awful lot like a stripped thread. TBD if itís on the frame, or more likely BB side.

I echo the above to try a different cup in that side.

Thread chasing wonít help. With some BB...
07-25-22, 01:52 PM
Replies: 10
Views: 255
Posted By jccaclimber

If you upload a video of the issue to YouTube or...

If you upload a video of the issue to YouTube or similar and post the title+username Iíll put a link here for you.
07-24-22, 10:57 AM
Replies: 19
Views: 524
Posted By jccaclimber

Following this theme, if you initially cut the...

Following this theme, if you initially cut the steer tube for a horizontal stem, you can also flip the stem to get height should you need more height than the remaining spacers allow.
07-23-22, 01:47 AM
Replies: 30
Views: 753
Posted By jccaclimber

Iíve only used the black ones once. For me they...

Iíve only used the black ones once. For me they werenít a ton better than the salmon ones dry, but weíre not nearly as good wet. As a result I just put the salmon ones on everything. That was a...
07-22-22, 12:03 PM
Replies: 30
Views: 753
Posted By jccaclimber

Two weeks ago I went for a lovely couple hour...

Two weeks ago I went for a lovely couple hour ride with a <20 pound bike and spent the remaining 10 hours playing with my 6 month old child. Canít wait until his neck is strong enough to stoke the...
07-21-22, 01:47 PM
Replies: 9
Views: 299
Posted By jccaclimber

The implication is that you wonít unintentionally...

The implication is that you wonít unintentionally damage the frame, have a seatpost that forever slips, etc. so long as a hammer is not involved.

If this is a Vitus with a set screw to hold the...
07-20-22, 02:29 PM
Replies: 35
Views: 1,540
Posted By jccaclimber

None that I can think of off hand. However, the...

None that I can think of off hand. However, the general concept of an angular contact or axial thrust bearing with a threaded preload/clearance adjustment is still done in many millions, if not...
07-20-22, 02:15 PM
Replies: 45
Views: 13,954
Posted By jccaclimber

You are correct in your technical statement. ...

You are correct in your technical statement.
Where you are incorrect is your decision to revive a many year old thread to bring that up.


True, but the GIF you posted above made me smile, so...
07-20-22, 02:59 AM
Replies: 44
Views: 996
Posted By jccaclimber

Itís the active ingredient in many of the rust...

Itís the active ingredient in many of the rust removers at the hardware store and will matte/darken the metal.
Sure, itíll start hydrogen embrittlement if you leave it in too long. I suppose it is...
07-18-22, 06:37 PM
Replies: 44
Views: 996
Posted By jccaclimber

Snarky replies aside, stripping to clean bare...

Snarky replies aside, stripping to clean bare metal and soaking in warm citric or phosphoric acid will probably give you a dull dark gray.
Proper black might involve calling other shops.
The...
07-18-22, 11:06 AM
Replies: 23
Views: 539
Posted By jccaclimber

I hesitate to say this given the tool we're...

I hesitate to say this given the tool we're talking about, but I suspect if you move the scale or bend the pointer arm so that it's points to zero again that it would work as well as the day it was...
07-17-22, 06:01 PM
Replies: 243
Views: 162,236
Posted By jccaclimber

I'm sure they're getting hard to find at this...

I'm sure they're getting hard to find at this point, but didn't they make different stiffness beams or bumpers for those?
07-17-22, 04:05 PM
Replies: 8
Views: 238
Posted By jccaclimber

Normally Iíd say that swapping the axle isnít...

Normally Iíd say that swapping the axle isnít that big a deal, assuming itís a the same diameter. However, if small adjustments arenít your thing, bearing cone adjustment, which will be needed to do...
07-17-22, 03:11 AM
Replies: 23
Views: 539
Posted By jccaclimber

The BB cups/shell are probably one of the less...

The BB cups/shell are probably one of the less torque critical joints on a bike. Iíd be much more worried about the fasteners securing the crank arm. That said, using the proper tool and process...
07-17-22, 03:07 AM
Replies: 10
Views: 296
Posted By jccaclimber

IME youíll have to strip any rusted areas to...

IME youíll have to strip any rusted areas to clean bare metal, at least locally. Iíve had success with a wire wheel, though careful use of sandpaper works as well. Obviously a gentle touch is...
07-15-22, 01:05 AM
Replies: 50
Views: 1,303
Posted By jccaclimber

There was a nice long rant about that silly tool...

There was a nice long rant about that silly tool on here recently. In short, itís $6 on Amazon for the official Shimano version.
Just donít forget about the little plate that goes in the gap when...
07-14-22, 07:12 PM
Replies: 50
Views: 1,303
Posted By jccaclimber

I think this is what the OP meant by ďswap the...

I think this is what the OP meant by ďswap the chainset.Ē, though it wasnít clear.
The chain might need to be a link longer with the larger front ring. Iíd assume the front derailer could be...
07-14-22, 01:56 AM
Replies: 41
Views: 844
Posted By jccaclimber

Not very long if you drag the brakes them down...

Not very long if you drag the brakes them down hills or ride a lot in wet dirty conditions. Seemingly forever in clean, dry, level conditions.
On one of my bikes I go through a set of tires every...
07-14-22, 01:44 AM
Replies: 50
Views: 1,303
Posted By jccaclimber

I hesitate to disagree with the second service...

I hesitate to disagree with the second service manager, but I still firmly believe that this is the shopís fault, not Shimanoís. If it had fallen off 6 months and 2k miles from now we could debate...
07-13-22, 12:39 PM
Replies: 50
Views: 1,303
Posted By jccaclimber

1. This is the shopís fault. They owe you a new...

1. This is the shopís fault. They owe you a new crank. While I wouldnít mention it to them now, Iím not sure if Iíd let them work on my bike again, assuming that you have alternatives. While I...
07-12-22, 03:03 PM
Replies: 27
Views: 589
Posted By jccaclimber

No, it will not make you look sophisticated, at...

No, it will not make you look sophisticated, at least it didnít work for me :).

I keep my solvents in glass jars. After a quick swirl-of-sophistication I put the entire jar, sealed, into a cheap...
07-12-22, 09:28 AM
Replies: 38
Views: 983
Posted By jccaclimber

Iím waiting for the day when working on our bikes...

Iím waiting for the day when working on our bikes requires a scan tool plus several thousand dollar per year software license. Iíd say that would usher in decent pay for bike mechanics, but it isnít...
07-10-22, 05:48 PM
Replies: 12
Views: 2,091
Posted By jccaclimber

Co-Motion lists 3 frame sizes for the Periscope...

Co-Motion lists 3 frame sizes for the Periscope on their web page. Even if they didnít, itís built in such a way that itís more like an adjustable crescent wrench than a fixed size.

Fit is...
07-09-22, 05:41 PM
Replies: 17
Views: 410
Posted By jccaclimber

This is the right answer. Get a crankset with...

This is the right answer. Get a crankset with the right ring mounts at your local bike kitchen and move the pedal holes down like this. If you donít mind the shipping, send to this guy.

Getting...
07-08-22, 12:24 PM
07-05-22, 05:38 PM
Replies: 38
Views: 983
Posted By jccaclimber

The official Shimano tool for this is all of $5,...

The official Shimano tool for this is all of $5, or if you want to get it from Jeff Bezos in which case itís less than $7. I think one even came with one of my cranks, though that would have been ~10...
07-04-22, 02:11 AM
Replies: 36
Views: 1,074
Posted By jccaclimber

Every day I browse the mechanics sub and am...

Every day I browse the mechanics sub and am always amazed that this thread, which has long since solved the OPís issue, continues to gain new posts. When ever will it die?

Based on other comments,...
07-03-22, 08:50 PM
Replies: 8
Views: 328
Posted By jccaclimber

I canít speak to the torque screwdriver model...

I canít speak to the torque screwdriver model above, but Iíve been pleased with CDIís dial type torque tools. They have been the default at several of the facilities I worked in. Iíve only seen one...
Showing results 1 to 50 of 1000
 


 
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