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Wanna turn down my threadless stem adapter on lathe to 21.1mm? For hire?

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Wanna turn down my threadless stem adapter on lathe to 21.1mm? For hire?

Old 07-09-13, 06:34 PM
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motorapido
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Wanna turn down my threadless stem adapter on lathe to 21.1mm? For hire?

I'd like to put a threadless stem adapter on a fork that takes the oddball 21.1mm quill size, so I am seeking a metal shop mechanic to turn down a Velo Orange threadless stem adapter to 21.1mm. I would buy the adapter, have it shipped to you, pay you to turn it to size and pay shipping back to me. The shame of it all was that I formerly owned a fully equipped shop in which I restored vintage motorcycles and motorscooters, and made many a part on my lathe and mill. Now, divorced and living in the city, away from my former suburban house and workshop, I have only the basic bicycle mechanic tools, since I sold my whole workshop. Poor me. Anybody want to take on this very simple job for hire? Here is the adapter I want to turn down to fit.

http://store.velo-orange.com/index.p...m-adaptor.html
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Old 07-09-13, 07:31 PM
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Call Yellow Jersey in Madison wisc. Ask to speak to Andy Muzi. He probably has the same or an equivalent adapter and can turn it down, saving you multiple shipping and delay.
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Old 07-10-13, 08:50 AM
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Alternatively brake cylinder hone might polish out the 0.55mmR [ID 1.1mm] from the fork steerer,
till it's 22.2 ID. .... 7/8 " vs. .833"

its not much and the quill reinforces the inserted length.
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Old 07-10-13, 09:21 AM
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Originally Posted by fietsbob View Post
Alternatively brake cylinder hone might polish out the 0.55mmR [ID 1.1mm] from the fork steerer,
till it's 22.2 ID. .... 7/8 " vs. .833"

its not much and the quill reinforces the inserted length.
honing is a very slow metal removing process. One could be there all day and load up a hone a few times before removing that much.

If the OP wants to open up the steerer the right tool is a reamer. But note that this is not safe for a French 25mm steerer.
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Old 07-10-13, 09:36 AM
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prior post ,same topic, Bike : Schwinn, .833 Inch stems

then .. suggested black steel quill stem riser , shown here..
http://sheldonbrown.com/harris/stems...#threadedriser

[TABLE]
[TR]
[TD]SM247[/TD]
[TD]13/16" (21.15 mm)[/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[/TABLE]

This post indicates they're obviously swayed by pretty polished parts ..

but, the black steel one is plug and play..
then the parts added are shims from its upper OD to the 9/8" ID of most threadless stems.



they can pretty it up with a polished tube sleeve spacer between the upper headset locknut
and the bottom of their new threadless stem..




yea rather than a cylinder hone a Machine shop with a 7/8" drill in the drill press,
and the setup done accurately. will make the Fork ID compatible too..

The drill bit in a Lathe and the fork moved towards the chuck
by the lathe operator would work too..

Last edited by fietsbob; 07-10-13 at 09:44 AM.
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Old 07-10-13, 08:07 PM
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I've seen them on ebay for really cheap. Before you start screwing around just check it out. Good luck.
http://www.ebay.com/itm/STEM-RISER-S...item5d41173e4f
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