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Turning End Bolts


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#1 alex_holden

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Posted 25 August 2017 - 03:20 AM

I recently turned a batch of slotted brass end bolts. Here is a detailed description of how I did it:
https://www.holdenco...nas.com/?p=1212

#2 OLDNICKILBY

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Posted 25 August 2017 - 07:54 AM

Oh You do make hard work of things I sell 12 of these bolts for £12 an d a set of  Taps for £3 Talk about using the " Whipped Cream and Boxing Glove method to kill the Cat  "

 Alex your time is more valuable than this

Nic



#3 Bruce McCaskey

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Posted 25 August 2017 - 10:48 AM

Impressive work Alex.

#4 alex_holden

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Posted 25 August 2017 - 10:51 AM

Impressive work Alex.


Thanks Bruce! :)

#5 Mr.Nate

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Posted 24 September 2017 - 10:10 PM

Alex,

 

That's great that you can make your own end bolts.  Making all the parts yourself is very "one of a kind craftsmanship" . If I had the machinery I would try some of that stuff myself.  I've been following the different steps on your blog. I really like what you have done with your reed manufacturing. Definitely a lost art. I sometimes think that if I could travel back in time I would look in on all the concertina factories that I could find and see what happened first hand. 



#6 alex_holden

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Posted 25 September 2017 - 02:22 AM

Thanks Nate! I'd love to see first hand how they made concertinas back in late Victorian era.

#7 DavePraties

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Posted 25 September 2017 - 02:43 AM

Hi Alex, Really enjoyed your bolt-making article. One thing struck me though, I use a late from time to time and sometimes I turn fine shafts that flex under a cutting tool. How I have always fixed this is with a traveling steady, fixed to the back of the tool post, and which moves with the saddle. Each cut, you re-set it to support the next cut. I may have misinterpreted the problem, but it may be worth a try. Best wishes, Dave.



#8 Theo

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Posted 25 September 2017 - 04:03 AM

You can also do this by making a hollow cutter mounted in the tailstock.  The size of the central hole defines the diameter of the finished piece.  I got the idea of this method after Geoff Crabb showed me the machine he stall has that came from the Crabb workshop.



#9 DavePraties

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Posted 25 September 2017 - 05:01 AM

That sounds like a good piece of kit Theo, was it designed for Crabbs, or is it a known tool? Do you have drawings? Dave



#10 alex_holden

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Posted 25 September 2017 - 05:48 AM

That sounds like a good piece of kit Theo, was it designed for Crabbs, or is it a known tool? Do you have drawings? Dave

 
That sounds similar to a box tool... I thought I might have to make one, but decided to try just turning the bolts conventionally first, and found that it works fine as long as I cut to final diameter in a single pass.
http://chestofbooks....the-Turret.html

Edited by alex_holden, 25 September 2017 - 05:49 AM.


#11 Theo

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Posted 25 September 2017 - 05:58 AM

Same principle Alex, but the Crabb tool that I copied is much simpler. Imagine an end mill with a hole up the centre and you have it. I made one very simply from a bit of silver steel bar, bored, filed some rather crude cutting edges on the end and it works.

#12 Theo

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Posted 25 September 2017 - 06:07 AM

Photo. Its 3/8 OD

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#13 adrian brown

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Posted 25 September 2017 - 06:11 AM

Same principle Alex, but the Crabb tool that I copied is much simpler. Imagine an end mill with a hole up the centre and you have it. I made one very simply from a bit of silver steel bar, bored, filed some rather crude cutting edges on the end and it works.

 

What an ingenious idea - I suppose working with brass, you'd not even have to harden it. I use a similar sort of tool to make thumb bush recesses on recorders, but never though about using one to make bolts.

 

Adrian


Edited by adrian brown, 25 September 2017 - 06:12 AM.


#14 DavePraties

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Posted 25 September 2017 - 07:37 AM

Ah, right, I understand. This is what I have always known as a hollow end mill, and are available from tool makers. Don't know if the exact size needed for concertina bolts is readily available though.



#15 alex_holden

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Posted 25 September 2017 - 11:45 AM

Ah, I see. That's very clever.




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