Can anyone make this

[ukdodger]

Anyone with a home workshop feel like making this for me? I'm quite willing to pay. It's about 8 inches by 4 inches. I have the exact dimesions of all the parts in AutoCad or on a .jpeg.

It's a thing for holding frames by the bottom bracket over a surface table. Thanks.

[Mick F]

Ferret Worrier has an excellent workshop with the necessary equipment. It must worth a PM.

Also, my mate Paul could be approached, but I know he's hugely busy.

[goatwarden]

It looks like it may consist of standard tooling parts, e.g. from WDS. Even if it isn't, it doesn't look terribly complicated and should be well within the capability of any toolmaker with a lathe.

[thirdcrank]

It looks like it may consist of standard tooling parts, e.g. from WDS. ....

That brings back some memories - they used to have a big production site by the river in Leeds near Kirkstall Forge. I thought they had gone belly up but I see they have a place in Pudsey - presumably the production is now done in the Far East. Sic transit....

http://www.wdsltd.co.uk/Machine%20tool% ... %20Drifts/

[ferrit worrier]

Ferret Worrier has an excellent workshop with the necessary equipment. It must worth a PM.

Also, my mate Paul could be approached, but I know he's hugely busy.

I was just thinking (dont do it often it hurts) I wouldn't mind a look at the drawings to get a better idea. I see I've been volunteerd

Drop me a pm and we'll have a chat etc

Malc

[ferrit worrier]

I've been having a think while having tea. It looks basicaly like a Bottle Jack with an attachment on the top for locking the BB in position. Can't see the reason for the spring but not a problem if it's needed. Looks like an interesting project should be straight forward.

Malc

[Mick F]

Hi Malc!
Sorry for volunteering you, but I absolutely knew you'd have something to say!
Thank you for not letting me down!

[ferrit worrier]

Hi Malc!
Sorry for volunteering you, but I absolutely knew you'd have something to say!
Thank you for not letting me down!

No problem, my pleasure. just awaiting the PM from ukdodger

Malc

[AMC]

Can't see the reason for the spring but not a problem if it's needed.

Would it allow you to move the bike towards or away from you a bit whilst working on it? Or is it an uppy-downy sort of spring? (Can you tell I'm not an engineer?)
Looks like an excellent idea whatever.

[ukdodger]

Can't see the reason for the spring but not a problem if it's needed.

Would it allow you to move the bike towards or away from you a bit whilst working on it? Or is it an uppy-downy sort of spring? (Can you tell I'm not an engineer?)
Looks like an excellent idea whatever.

No it's used for holding frames parallel to an alignment table so you can check and alter the alignment of a frame.

[AMC]

Ah - that makes sense now. Thanks for the pic.

[531colin]

Tell me to mind my own business if you like, but why would somebody building frames need somebody else to make something like this? I think all you need is an old bottom bracket unit (if you want rhe best job get somebody to machine off the thread and the flange that buts up to the bottom bracket) . A piece of screwed rod through the middle (stainless for flux/heat resistance). A stack of plates to raise the frame off the bench , leaving just enough space to shim it. Probably machine a spacer to centralise the bottom bracket on the screwed rod. Whoever makes it, the crux is fitting it square to the table . I would fix the plates to the table with 3 bolts( milking stools have 3 legs so they can't rock). use a bottom bracket and chainstay to measure off the table to shim the plates etc. level wherever you put the dropout in a circle round the fitting. Unfortunately, I am too stipid to be able to get a drawing onto my computer!

[ferrit worrier]

Hi 531Colin

What it boils down to is, if you start with a jig that is 100% accurate then what you build comes out pretty much the same. to put this together you will need to turn the top and bottom faces to be parrallel any error in the base will be magnified at the head tube and top of seat tube. Idealy when the frame is complete if you were to connect a straight edge perpendicular to the BB spindal and rotate it past the head tube and seat tube on both sides, the seat tube and down tubes should be equidistant from the straight edge. If youve got a "wobbly" base to start with you wont get the accuracy.

Malc

[ukdodger]

Tell me to mind my own business if you like, but why would somebody building frames need somebody else to make something like this? I think all you need is an old bottom bracket unit (if you want rhe best job get somebody to machine off the thread and the flange that buts up to the bottom bracket) . A piece of screwed rod through the middle (stainless for flux/heat resistance). A stack of plates to raise the frame off the bench , leaving just enough space to shim it. Probably machine a spacer to centralise the bottom bracket on the screwed rod. Whoever makes it, the crux is fitting it square to the table . I would fix the plates to the table with 3 bolts( milking stools have 3 legs so they can't rock). use a bottom bracket and chainstay to measure off the table to shim the plates etc. level wherever you put the dropout in a circle round the fitting. Unfortunately, I am too stipid to be able to get a drawing onto my computer!

The thing is the post has to be precisly at right angles to the table. If not any variation at the post will be magnified at the other end of the tube. That's why framebuilders machine these posts and use dead flat steel or granite aligment tables. No doubt you could find a builder that doesnt use either but I dont know one.

[goatwarden]

I think all you need is an old bottom bracket unit (if you want rhe best job get somebody to machine off the thread and the flange that buts up to the bottom bracket) . A piece of screwed rod through the middle

I think if the spindle through the jig was only a bored out bottom bracket spindle you would bend it pretty soon. When I used to design jigs and fixtures for use in our automotive foundry I was consistently amazed by the ability of huge lumps of tool steel to get bent or broken inexplicably.