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Search: Posts Made By: chojn1
Showing results 1 to 29 of 29
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Forum: Tandem Cycling
02-24-14, 07:32 AM
Replies: 109
Views: 16,958
Posted By chojn1

Thanks guys, It has been an intellectually...

Thanks guys,

It has been an intellectually stimulating and productively gratifying experience.
Of course, I could not have done it without your help.
I am still amazed at the power of the...
Forum: Tandem Cycling
02-20-14, 12:54 PM
Replies: 109
Views: 16,958
Posted By chojn1

The bike is essentially complete. I did manage...

The bike is essentially complete. I did manage to get in about 30 miles over the weekend, ten of which was on a mountain bike trail. I did a few bunny hops and a couple of foot deep drops but...
Forum: Tandem Cycling
02-13-14, 10:51 PM
Replies: 109
Views: 16,958
Posted By chojn1

Cable guides 364438364439

Cable guides
364438364439
Forum: Tandem Cycling
02-13-14, 10:40 PM
Replies: 109
Views: 16,958
Posted By chojn1

364313 Build out is progressing well. I've...

364313

Build out is progressing well. I've decided just to use some spare components I have around. It is set up as a hybrid/mountain tandem which has the advantage of allowing me to test the...
Forum: Tandem Cycling
02-12-14, 07:50 PM
Replies: 109
Views: 16,958
Posted By chojn1

Wayne, I am a little concerned. But the...

Wayne,

I am a little concerned. But the guides are detachable and easily replaced with an alternate design.
Here they are:

364133
The ones with the parallel groves is for the front...
Forum: Tandem Cycling
02-12-14, 07:45 AM
Replies: 109
Views: 16,958
Posted By chojn1

I layered some carbon fiber patches overnight. ...

I layered some carbon fiber patches overnight. I'll trim and carve them when I get home from work. Rather using tubes, I think I'll just cut groves in them. I am hoping the stainless steel cable...
Forum: Tandem Cycling
02-11-14, 05:44 PM
Replies: 109
Views: 16,958
Posted By chojn1

Thanks for the advice. I was about to pull out...

Thanks for the advice. I was about to pull out some aluminum tubes - that would have been a mistake. What about stainless steel cable on carbon fiber? I don't have any Delrin, but I have plenty of...
Forum: Tandem Cycling
02-11-14, 12:55 PM
Replies: 109
Views: 16,958
Posted By chojn1

Hi all, First , my apology for the tardiness...

Hi all,

First , my apology for the tardiness of this update. Work, our active travel schedule, and life in general got quite hectic last year. What little bit of free time I had was spent...
Forum: Tandem Cycling
01-29-13, 08:18 AM
Replies: 109
Views: 16,958
Posted By chojn1

Wayne, My crankset only came with 2 spacers, so...

Wayne,
My crankset only came with 2 spacers, so I interpreted the instruction to mean 2 on the right and none on the left. I think I will wait for the build out then do what ever it takes to line...
Forum: Tandem Cycling
01-27-13, 08:31 PM
Replies: 109
Views: 16,958
Posted By chojn1

Homey, I like to use different tires for...

Homey,
I like to use different tires for different rides. Skinny tires are great for street only use, but for touring with off road/trail rides I like the fat tires for comfort and durability. ...
Forum: Tandem Cycling
01-20-13, 08:10 PM
Replies: 109
Views: 16,958
Posted By chojn1

Wayne, According to the stiffness...

Wayne,

According to the stiffness formula,there are 2 ways to increase the stiffness of a hollow tube.

Stiffness = EI
Where E is Young's Modulus of Elasticity and I is the Moment of Inertia....
Forum: Tandem Cycling
01-16-13, 09:00 PM
Replies: 109
Views: 16,958
Posted By chojn1

Wayne, To answer your question, my carbon...

Wayne,

To answer your question, my carbon tubes are standard stock from Rockwest. They are Unis layered at 0,45, and 90 degree designed for longitudinal stiffness. The top tube OD is 34.8 and ID...
Forum: Tandem Cycling
01-13-13, 09:01 PM
Replies: 109
Views: 16,958
Posted By chojn1

Hi PK, I am using Bostik L1007M for the primer....

Hi PK,
I am using Bostik L1007M for the primer.
Works pretty well. Here it is on the drop out:

293471

I put my entire body weight (140 lb) on that bond and it held.

I got busy with other...
Forum: Tandem Cycling
01-06-13, 08:54 PM
Replies: 109
Views: 16,958
Posted By chojn1

Sorry I have not updated in a while. Now that...

Sorry I have not updated in a while. Now that the holiday break is over, my day job is getting in the way of ride time and build time.

Here is the bike so far:

Rear bottom bracket cluster:
...
Forum: Tandem Cycling
12-31-12, 07:54 AM
Replies: 109
Views: 16,958
Posted By chojn1

Head tube cluster: 291027 Eccentric...

Head tube cluster:

291027

Eccentric cluster:

291028

Front triangle:
Forum: Tandem Cycling
12-27-12, 11:56 AM
Replies: 109
Views: 16,958
Posted By chojn1

PK, Thanks for the lead. I can find the AC130...

PK,
Thanks for the lead. I can find the AC130 prep, but the primers (either BR127 or BR6747) are giving me trouble. Coastline can order them for me, but it will take four weeks. That's a little...
Forum: Tandem Cycling
12-26-12, 07:53 AM
Replies: 109
Views: 16,958
Posted By chojn1

Hey, Thanks for the words of encouragement. ...

Hey,
Thanks for the words of encouragement. Seriously though, I am blessed with a very rewarding day job that I love. This is just a fun little project. What little I know on building carbon...
Forum: Tandem Cycling
12-23-12, 05:37 PM
Replies: 109
Views: 16,958
Posted By chojn1

That is odd. I don't work with php files. These...

That is odd. I don't work with php files. These jpegs come straight off my phone. I did re-size them thinking that was the problem. Usually there is no problem with the upload, and it display...
Forum: Tandem Cycling
12-23-12, 03:06 PM
Replies: 109
Views: 16,958
Posted By chojn1

I forgot to ask: Does anyone know the diameter...

I forgot to ask:
Does anyone know the diameter and width of the Gates CDX 69 teeth pulley with belt in place? Also what is the distance between the pulley and the center line? I want to make sure...
Forum: Tandem Cycling
12-23-12, 02:39 PM
Replies: 109
Views: 16,958
Posted By chojn1

I've reduced the size of the attachments,...

I've reduced the size of the attachments, hopefully they are view-able now. Let me know if you are still having trouble with them.

I've also started with my homemade jig:
289814

Essentially,...
Forum: Tandem Cycling
12-23-12, 08:49 AM
Replies: 109
Views: 16,958
Posted By chojn1

This is my working drawing for the frame: ...

This is my working drawing for the frame:
289812
I do like the look of a lat-less design. This design will save weight and reduce the coupler requirement to four instead of six. It is a...
Forum: Tandem Cycling
12-23-12, 08:24 AM
Replies: 109
Views: 16,958
Posted By chojn1

Hi PK, How do I surface prep the titanium...

Hi PK,
How do I surface prep the titanium parts?
I've read that I need to etch with chromic acid and prime with BR-127. All I have in my shop is ferric chloride for copper etching and muriatic...
Forum: Tandem Cycling
12-22-12, 07:31 AM
Replies: 109
Views: 16,958
Posted By chojn1

PK, These are my dropouts: 289579 They...

PK,
These are my dropouts:
289579

They are titanium from Paragon. How do I prepare them for carbon bonding?

Thanks,
CJ
Forum: Tandem Cycling
12-22-12, 07:19 AM
Replies: 109
Views: 16,958
Posted By chojn1

Here are the missing pictures: 289605289606 ...

Here are the missing pictures:
289605289606
As you can see I'm using mostly 3k weave. You are right about the 12k, but I'm using it mostly in tow form for building up bulk fast. I used it on the...
Forum: Tandem Cycling
12-21-12, 08:29 AM
Replies: 109
Views: 16,958
Posted By chojn1

PK, I am not an engineer and have no experience...

PK,
I am not an engineer and have no experience with carbon or Kevlar, so your help is very much appreciated.

I am using prefabricated cf tubes raging from .5 to 1.75 in OD with wall thickness of...
Forum: Tandem Cycling
12-20-12, 07:41 AM
Replies: 109
Views: 16,958
Posted By chojn1

PK, No time to take pictures of myself, but...

PK,
No time to take pictures of myself, but imagine an open 2 car garage workshop with dust collector and HEPA filter. I have goggles, respirator, gown, and glove. I don't take chances.

I've...
Forum: Tandem Cycling
12-19-12, 08:19 AM
Replies: 109
Views: 16,958
Posted By chojn1

Hi Sheldon, Thanks for the link. Nick...

Hi Sheldon,
Thanks for the link. Nick Crumpton's site is fantastic. A lot of great information. Thanks.

PK,
Thanks for the tips. The wax was just to release the fiber glass tube from the...
Forum: Tandem Cycling
12-18-12, 07:33 AM
Replies: 109
Views: 16,958
Posted By chojn1

Thanks PK and Homey for the replies and...

Thanks PK and Homey for the replies and encouragement. I do have a well equipped woodworking garage shop. While this won't help much with building the bike, it will help me build the jig for the...
Forum: Tandem Cycling
12-17-12, 07:25 AM
Replies: 109
Views: 16,958
Posted By chojn1

Home-built Custom Coupled Carbon Fiber Touring Tandem Bike

My wife and I have been into riding tandem bikes for the last 5 years. We ride at least four times a week or whenever we could get the time. We have four other bikes, but they rarely get used...
Showing results 1 to 29 of 29


 
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