Lathe in Rlab advice and help needed

[martinkayak2000]

Can the big lathe turn an object 18cm radius , I need to turn the cog off a bicycle chainwheel and the crank is 18cm long, the chainwheel has solid continuous metal in the area to be turned,

I would need assistance from a lathe expert , is any such person around Saturday afternoon / eve ? If it is possible then it shouldn't take more than 15mins.

The chainwheel is on a cottered crank - so should fit in a three jaw chuck.

[Steve Rodway]

Unfortunately not, that's just slightly beyond it's maximum capacity of
330mm diameter

Steve

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[Eric Rowen]

You need a lathe where the bed does not extend quite so far or I have seen some where a short section of the bed can be removed to allow for the greater diameter. 

On Thu, Sep 28, 2017 at 7:43 PM, Steve Rodway <St...@legionelectronics.co.uk> wrote:

Unfortunately not, that's just slightly beyond it's maximum capacity of
330mm diameter

Steve

martinkayak2000 wrote:
> Can the big lathe turn an object 18cm radius , I need to turn the cog
> off a bicycle chainwheel and the crank is 18cm long, the chainwheel has
> solid continuous metal in the area to be turned,
> I would need assistance from a lathe expert , is any such person around
> Saturday afternoon / eve ? If it is possible then it shouldn't take more
> than 15mins.
> The chainwheel is on a cottered crank - so should fit in a three jaw chuck.
>
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[Steve Rodway]

Yeah they're called gap-bed lathes, it usually adds 30-50% to the
maximum diameter that can be turned. Last I heard bristol hackspace had
one but it wasn't yet functional, maybe one of the other hackspaces in
the area has one?

Eric Rowen wrote:
> You need a lathe where the bed does not extend quite so far or I have
> seen some where a short section of the bed can be removed to allow for
> the greater diameter.
>
> On Thu, Sep 28, 2017 at 7:43 PM, Steve Rodway

> <St...@legionelectronics.co.uk <mailto:St...@legionelectronics.co.uk>>

> wrote:
>
> Unfortunately not, that's just slightly beyond it's maximum capacity of
> 330mm diameter
>
> Steve
>
> martinkayak2000 wrote:
> > Can the big lathe turn an object 18cm radius , I need to turn the cog
> > off a bicycle chainwheel and the crank is 18cm long, the chainwheel has
> > solid continuous metal in the area to be turned,
> > I would need assistance from a lathe expert , is any such person around
> > Saturday afternoon / eve ? If it is possible then it shouldn't take
> more
> > than 15mins.
> > The chainwheel is on a cottered crank - so should fit in a three
> jaw chuck.
> >
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> <mailto:reading-hackspace%2Bunsu...@googlegroups.com>>.

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> <https://groups.google.com/d/optout>.

>
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[Steve Rodway]

I've just measured up and my Lathe at home in Bath can just about handle
that size, but I'm down here now and won't be back in reading for a
fortnight or so, then back down again a week or two later, then back to
reading a week or two after that, so it could well be 6 weeks before I
got it back to you. Add to that the fact that it's a large job for my
machine and a substantial off-center load for a small machine which is
likely to make the job tricky and the finish poor, if you can find a
large or gap bed lathe anywhere nearer I'd suggest going that route instead

Steve

[scott murdoch]

I can take it into work and do it in the week, can collect Monday evening if it helps ?

On 28 Sep 2017 21:38, "Steve Rodway" <St...@legionelectronics.co.uk> wrote:

I've just measured up and my Lathe at home in Bath can just about handle
that size, but I'm down here now and won't be back in reading for a
fortnight or so, then back down again a week or two later, then back to
reading a week or two after that, so it could well be 6 weeks before I
got it back to you. Add to that the fact that it's a large job for my
machine and a substantial off-center load for a small machine which is
likely to make the job tricky and the finish poor, if you can find a
large or gap bed lathe anywhere nearer I'd suggest going that route instead

Steve

Steve Rodway wrote:
> Yeah they're called gap-bed lathes, it usually adds 30-50% to the
> maximum diameter that can be turned. Last I heard bristol hackspace had
> one but it wasn't yet functional, maybe one of the other hackspaces in
> the area has one?
>
>
> Eric Rowen wrote:
>> You need a lathe where the bed does not extend quite so far or I have
>> seen some where a short section of the bed can be removed to allow for
>> the greater diameter.
>>
>> On Thu, Sep 28, 2017 at 7:43 PM, Steve Rodway

>> <St...@legionelectronics.co.uk <mailto:Steve@legionelectronics.co.uk>>

>> wrote:
>>
>>     Unfortunately not, that's just slightly beyond it's maximum capacity of
>>     330mm diameter
>>
>>     Steve
>>
>>     martinkayak2000 wrote:
>>     > Can the big lathe turn an object 18cm radius , I need to turn the cog
>>     > off a bicycle chainwheel and the crank is 18cm long, the chainwheel has
>>     > solid continuous metal in the area to be turned,
>>     > I would need assistance from a lathe expert , is any such person around
>>     > Saturday afternoon / eve ? If it is possible then it shouldn't take
>>     more
>>     > than 15mins.
>>     > The chainwheel is on a cottered crank - so should fit in a three
>>     jaw chuck.
>>     >
>>     > --
>>     > You received this message because you are subscribed to the Google
>>     > Groups "Reading Hackspace" group.
>>     > To unsubscribe from this group and stop receiving emails from it, send

>>     > an email to reading-hackspace+unsubscribe@googlegroups.com
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>>     > <mailto:reading-hackspace+unsub...@googlegroups.com

>>     <mailto:reading-hackspace%2Bunsu...@googlegroups.com>>.
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>>     <https://groups.google.com/d/optout>.
>>
>>     --
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>>
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[Arthur]

another option is to to take it off the crank, usually by drilling the rivet things they usually use, then putt it back on using bolts. I did that when I converted my MTB from a 3x7 to a 1x9 and didn't want to pay for a whole new crank set. so I just bought the cog.

On Friday, 29 September 2017 00:33:42 UTC+1, scottmurdoch2010 wrote:

I can take it into work and do it in the week, can collect Monday evening if it helps ?

On 28 Sep 2017 21:38, "Steve Rodway" <St...@legionelectronics.co.uk> wrote:

I've just measured up and my Lathe at home in Bath can just about handle
that size, but I'm down here now and won't be back in reading for a
fortnight or so, then back down again a week or two later, then back to
reading a week or two after that, so it could well be 6 weeks before I
got it back to you. Add to that the fact that it's a large job for my
machine and a substantial off-center load for a small machine which is
likely to make the job tricky and the finish poor, if you can find a
large or gap bed lathe anywhere nearer I'd suggest going that route instead

Steve

Steve Rodway wrote:
> Yeah they're called gap-bed lathes, it usually adds 30-50% to the
> maximum diameter that can be turned. Last I heard bristol hackspace had
> one but it wasn't yet functional, maybe one of the other hackspaces in
> the area has one?
>
>
> Eric Rowen wrote:
>> You need a lathe where the bed does not extend quite so far or I have
>> seen some where a short section of the bed can be removed to allow for
>> the greater diameter.
>>
>> On Thu, Sep 28, 2017 at 7:43 PM, Steve Rodway

>> <St...@legionelectronics.co.uk <mailto:St...@legionelectronics.co.uk>>

>> wrote:
>>
>>     Unfortunately not, that's just slightly beyond it's maximum capacity of
>>     330mm diameter
>>
>>     Steve
>>
>>     martinkayak2000 wrote:
>>     > Can the big lathe turn an object 18cm radius , I need to turn the cog
>>     > off a bicycle chainwheel and the crank is 18cm long, the chainwheel has
>>     > solid continuous metal in the area to be turned,
>>     > I would need assistance from a lathe expert , is any such person around
>>     > Saturday afternoon / eve ? If it is possible then it shouldn't take
>>     more
>>     > than 15mins.
>>     > The chainwheel is on a cottered crank - so should fit in a three
>>     jaw chuck.
>>     >
>>     > --
>>     > You received this message because you are subscribed to the Google
>>     > Groups "Reading Hackspace" group.
>>     > To unsubscribe from this group and stop receiving emails from it, send

>>     > an email to reading-hacksp...@googlegroups.com

>>     <mailto:reading-hackspace%2Bunsu...@googlegroups.com>
>>     > <mailto:reading-hackspace+unsub...@googlegroups.com
>>     <mailto:reading-hackspace%2Bunsu...@googlegroups.com>>.
>>     > For more options, visit https://groups.google.com/d/optout
>>     <https://groups.google.com/d/optout>.
>>
>>     --
>>     You received this message because you are subscribed to the Google
>>     Groups "Reading Hackspace" group.
>>     To unsubscribe from this group and stop receiving emails from it,

>>     send an email to reading-hacksp...@googlegroups.com

>>     <mailto:reading-hackspace%2Bunsu...@googlegroups.com>.
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>>     <https://groups.google.com/d/optout>.
>>
>>
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[martinkayak2000]

Thanks for all the advice , I will re think , I will check the big lathes at my work , I'm trying to preserve both parts,