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 Post subject: Re: New lathe
PostPosted: Tue Mar 24, 2020 10:54 pm 
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Whilst you're contemplating the purchase of a lathe you might like to obtain a copy of 'The Complete Illustrated Guide to Precision Barrel Fitting' by John Hinnant. Available from Amazon.

It's a little out of date but, when you're starting off, that's no bad thing.


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 Post subject: Re: New lathe
PostPosted: Fri Mar 27, 2020 1:25 am 
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I think I all ready have a copy.


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 Post subject: Re: New lathe
PostPosted: Wed Apr 22, 2020 10:52 pm 
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I all ready have a copy of The Complete Illustrated Guide to Precision Barrel Fitting' by John Hinnant.
I have been reading it to day sat in the back garden enjoying the sun shine.

Also reading Davids post and letting it sink in.
Quote:
You do not need range rods to crown a barrel, nor spiders or multiple DTI's to the level you need.

You need:
A three jaw chuck.
A suitable diameter piece of black nylon or Delrin to act as a bushing for the rear of the rifle barrel.
A 4 jaw chuck.
Some soft inserts for a 4 jaw chuck.
A finger DTI
A micro boring bar (I gave you some)

Measure the internal diameter of your headstock.
Stuff a lump of Delrin in your 3 jaw and carefully machine it to size so it is going to be a snug sliding fit in your lathe headstock. Do not remove it from the lathe.

Measure the OD of the the rifle just before the largest diameter and bore the piece of Delrin in the chuck to suit.
Fit your 4 jaw.
Push the bushing in from the rear of the lathe and follow this with the barrel, get it right and the barrel will 'jam' with the muzzle sticking out of the 4 jaw by around an inch.
Insert the soft inserts, some small slips of brass of aluminium will do the job, you should have loads from me.
Lightly tighten the 4 jaw and clock the OUTSIDE of the barrel first, it is so much easier to chase a small error later on than a huge error when working with a 4 jaw unless you are lucky enough to be very experienced with clocking in. I use 4 jaws weekly if not daily and still allow a good few minutes to clock in a barrel or chamber correctly.
Now use our finger DTI on the internal bore to make the final adjustments. A 0,01mm DTI is ample (half thou ish)

Yes there will be some 'parallax' error (For want of a better word) using a bushing, at the receiver end instead of an outboard spider however it is not enough for you to worry about and you can always make spider at a later date.

The new lathe is off the menu for obvious reasons.

But shed time is keeping me sane.


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 Post subject: Re: New lathe
PostPosted: Tue Jun 23, 2020 11:41 pm 
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I decided to buy a new one. It's my birthday next month. Her indoors has sanctioned it. I just need to find somewere to put it. That's lathe number four and definitely the last one.
Attachment:
LATHE.jpg
LATHE.jpg [ 123.36 KiB | Viewed 251 times ]


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 Post subject: Re: New lathe
PostPosted: Wed Jun 24, 2020 7:14 am 
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Location: The Lincolnshire Wolds, UK
Home club or Range: Hemswell Shooting Club. North Coates Butts UK. Grove Small Arms, Barton Road UK. Ulfborg Skyttecenter DK. BASC Trade Member
That looks to be handy, make sure you have a very solid base. What is it between centres and throw, I am trying to get a sense of scale.

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 Post subject: Re: New lathe
PostPosted: Wed Jun 24, 2020 8:35 am 
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Location: North-East Scotland
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Alpha1 wrote:
I decided to buy a new one. It's my birthday next month. Her indoors has sanctioned it. I just need to find somewere to put it. That's lathe number four and definitely the last one.
Attachment:
LATHE.jpg


Who sells these in the UK ?

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 Post subject: Re: New lathe
PostPosted: Wed Jun 24, 2020 9:47 am 
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Ovenpaa wrote:
That looks to be handy, make sure you have a very solid base. What is it between centres and throw, I am trying to get a sense of scale.


Spindle bore is 36mm
Its 570mm between centres.


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 Post subject: Re: New lathe
PostPosted: Wed Jun 24, 2020 9:48 am 
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waterford103 wrote:
Alpha1 wrote:
I decided to buy a new one. It's my birthday next month. Her indoors has sanctioned it. I just need to find somewere to put it. That's lathe number four and definitely the last one.
Attachment:
LATHE.jpg


Who sells these in the UK ?


Chester machine tools.


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 Post subject: Re: New lathe
PostPosted: Thu Jun 25, 2020 1:29 pm 
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Location: Essex
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Alpha1 wrote:
waterford103 wrote:
Alpha1 wrote:
I decided to buy a new one. It's my birthday next month. Her indoors has sanctioned it. I just need to find somewere to put it. That's lathe number four and definitely the last one.
Attachment:
LATHE.jpg


Who sells these in the UK ?


Chester machine tools.


have you ordered it yet ?

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 Post subject: Re: New lathe
PostPosted: Thu Jun 25, 2020 2:28 pm 
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No, I have to lay a base and have a wooden shed erected to house it first and before I committed to that I had to make sure the wife was OK with spending the money to do it. It's a lot of money for me to just by a toy to tinker with. It's a project I am hoping to have it all done by the end of the year. ( I bought her just under £4000 worth of new furniture that sort of swung it.)


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