G&S Titanium of Wooster specializes in titanium wire
drawn products. During the late 80’s and
90’s, they were one of the small cadre of companies from Wooster that
specialized in supplying bicycle OEM
manufacturers with everything from weld wire, to bolts, and custom machined
Long a provider only to large OEM companies, they want to
begin to reach out to the smaller manufacturers of titanium bicycles as part of
a new direct to consumer business plan.
Over the last 2 months I have worked with Tyler LaFave, the head sales
representative, to establish pricing for DOMESTIC 6/4 Ti filler wire.
All materials are produced and drawn here in the US:
Ti 6-4 Eli
AWS A5.16-13 ERTI-23
- .030" X 36" S/L - $75.00/lb.
- .035" X 36" S/L - $75.00/lb.
- .046" X 36" S/L - $70.00/lb.
- .063" X 36" S/L - $65.00/lb.
A three pound minimum order is required.
Any builder with liability insurance and a business license is
qualified to order.
Please contact Tyler directly to begin a relationship with this excellent
Though the process of creating a custom bicycle varies from customer to customer, the basic components are the same, allowing the use of dedicated tooling to be created. Often this tooling is designed with a range of variability so that minor changes in design can be accommodated.
Production work, however, necessitates that dedicated, fixed position equipment be used to ensure accurate, repeatable results from piece to piece.
Today, I want to talk about the importance of "soft jaws". Soft jaws are replaceable tooling that hold a part for machining, often not heat treated, allowing the operator two distinct advantages; the ability to shape the jaws to perfectly fit the piece being machined. Secondly, the shaped clamping surface provides greater surface contact allowing for a less robust clamping surface, leaving no impressions on the finished part.
The example we are going to look at here is a set of jaws that were shaped to accept the spider interface for the Hot Rod cranks. In this case, the part is water jet cut to the rough dimensions and the center hole needs to be opened up to 24.02 mm and then face relieved a skoosh so that it is a tight slip fit over the bottom bracket spindle.
The base part, before machining
To place this part into a standard set of pointed hard jaws in a lathe makes concentricity difficult to attain part to part, as there is minimal surface contact between the jaws and the part to be machined. I used a tool post grinder, mounted to the cross slide, to create a shaped opening in the face of the jaws, allowing me to have a surface that holds the part perfectly flat and concentric to the spindle for machining.
The lathe jaws, ground to accept the part
This shaping of the jaws permits a consistent origin point from which to begin the machining process, and contacts a majority of the outer surface leaving no clamping impression, therefore meeting our goals.
The part clamped and machined in the soft jaw
Whether in a vice, lathe, or in a fixture, precision soft jaws created for the operation are an asset to the fabricator and should be considered for any production piece.
Forums are places where folks of like minds can gather to enthusiastically share their interests, hobbies, and professions. The ironic twist with the niche of frame builders is that our numbers are so small, often pros, hobbyists, and lurkers share the same space. Professionals who desire to mentor, share, and encourage others to begin the journey to mastery, struggle with how to set standards for acceptable practices. Keeping "the bar raised" on what is to be considered the standard for quality is no easy task. The issue with the internet, is that misinformation spreads like wildfire. "Experts" are born behind a keyboard and within a short time, are establishing facts that are anything but, only to have others pass it on. The crux is when an experienced pro who knows better attempts to correct the misinformation, only to be barraged with negativity. Soon, the experienced mentors retreat to their shops, frustrated and unwilling to make the effort again. This is how the loss of knowledge begins in today's classroom of zeros and ones. Enough time has transpired through many list serves/forums/pages that it has become clear to me that one can never remove the human element of ego and need for affirmation from discourse, regardless of the subject. Moderation can provide some constraint, but will never re-direct those who refuse to acknowledge or conform, regardless of the experience or knowledge possessed by those offering assistance. The best way to "keep the bar high" and provide the level of mentoring we wish to convey is to be the one on the field keeping the bar in place, setting the professional example. It takes time to be a presence, guide, mentor via the interwebs, and each of us must decide if that is within themselves to share and provide at the cost of time, frustration, and little thanks. A unified presence/effort by those that want to make a difference and see standards set is the tool to get this job done. I'll continue to add my voice where appropriate and hope for a chorus and not an echo. rody
Picked up a new to me Diacro bender that had a stud broken off in the fixturing portion of the table. Here's a quick video showing one method of removing it so that the table will be fully functional again....
You've likely heard the instant ripples coming across the internet; yes, there is another bottom bracket spec coming down the line. This time, however, it is not driven by a big corporation wishing to redevelop a standard to sell more of their branded components, it's origins lie among a small frame builder, a family owned component company, and the man who has been responsible for the explosion in frame building today by developing more high quality fiddly bits and offering them for sale, than any other.
It began one year ago, at the Philly Expo, when a conversation between a customer and a builder blossomed into a discussion on what needed to improve upon the bicycle as we know it. At the crux of the conversation, the inadequacy of most frame builders to accurately create a high tolerance, well machined interface for the press fit 30 bearings, and therefore, the erosion of consumer confidence in the standard.
Once you've been in this industry long enough, you begin to see "trends" come around a time or two. The complaints about the press fit 30 bottom bracket ring through the air; the bearings must be pressed in with a special tool, after use they can creak and make noise, bearings fail more rapidly, they are hard for consumers to work on, etc... Anyone remember Klien, Fat Chance, and a few others? Pressed in bearings that gave people fits and subsequently went back to threaded interfaces...here we go again.
Let me introduce the T47 bottom bracket; a piece that begins with the same inner diameter as the press fit 30 and then adds threads. Isn't this just a bigger standard English bottom bracket? Nope, let me explain why...
The T47 has the following positive attributes:
- uses a larger shell to allow oversized diameter tubing to match without swaging
- the shell is thick enough to allow welding of both steel and titanium without distortion
- the threads are properly sized to facilitate hand tapping post fabrication and for maintenance
- the bb shell will allow cups to fit all current crank spindle sizes
- existing frames with press fit 30 metallic shells can now be reamed and tapped with threads, prolonging their lifespans of use
- at least three bottom bracket manufacturers are already producing parts for this spec, so parts will be available
The T47 has the following negatives characteristics:
- weighs slightly more than a standard English bottom bracket shell of the same width
- builders will have to purchase new taps and make tooling accommodations
- people who like to grumble have another opportunity to do so
I've been fortunate to have known of this for quite some time and I'm in favor of it. I like the fact that if I include it in a build, it allows the customer to have options in the future. I like the fact that it will save some frames already equipped with noisy pf30 shells. I like the fact that a certain headset maker whose product I love will be making their first bottom bracket to match this spec. I like the fact that I have a shell in my hand to build one of the first bikes...off to the shop to start making plans.