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Old Feb 27, 2012, 07:23 PM
Philip Pemberton
Guest
n/a Posts
Good quality 80mm lathe chucks, machine vices and tools for a Hobbymat MD65?

Hi all,

Well, my Hobbymat MD65 mini-lathe is doing sterling service now it's been
treated to a decent "CLA" (clean, lubricate and adjust) session. The
tailstock jams if you accidentally pull it in past zero and there's a bit
of backlash on the horizontal leadscrew, but that's about it. Certainly
nothing that would prevent it from being used.

Problem is, now I find myself in a predicament: I don't have the external
jaws for the Polish-made three-jaw Hobbymat chuck... and I need to turn a
1-5/8in. diameter aluminium rod down to a more reasonable size and put a
few centred holes in it. Naturally this thing is just slightly too large
for the internal jaws...

The externals aren't available as a spare part, so I'm looking to get a
second chuck (possibly two, a 3jaw self-centering and a 4-jaw independent
plus a dial indicator). You can probably predict my question, but I'll
ask it anyway... :)


Can anyone suggest a decent quality chuck for my MD65?


The standard chuck is an 80mm diameter thing with three M6 bolts
protruding from the rear face (at 120-degree angles from each other) for
fixing. These bolts are pushed through the faceplate and secured with
nuts on the rear. I'd prefer this type of fixing if at all possible;
installing bolts from the back of the faceplate would be tricky at best
(and possibly involve at least partly disassembling the spindle section,
which is Not Fun At All).

As I recall, the faceplate has six holes drilled into it at various
spacings. There's a photo here:
http://www.model-engineer.co.uk/site...ms/42726/photo
%201a.jpg

I have no idea if it'll take the four-screw fittings the four-jaw chucks
seem to use, but it'll certainly take a chuck with the three-screw mount.


I've also read that it's possible to install a 100mm chuck using an
adapter backplate, so that's another possibility (if I can find a
suitable backplate).


I've been looking at three chucks --
Chronos - "Imported" chucks and "Soba" branded
RDG - HBM? (Indian made apparently, and AIUI not very good quality)


Does anyone have any experiences with these? Are they up to much, or
should I be looking elsewhere?

I'm also after a suitable machine vice for the milling bracket -- the
manual specifies "50mm opening" but says nothing about the mounting
requirements. So if anyone can suggest a reasonably good quality machine
vice suitable for an MD65, I'd appreciate it if you could share the
details with me :)

Lastly, I'd appreciate it if someone could suggest some decent turning
tools. I've used the Soba ones from Chronos (the ones which come in the
blue plastic box) but haven't had much luck with them.

Thanks,
--
Phil.
philpem@philpem.me.uk
http://www.philpem.me.uk/
Old Feb 27, 2012, 08:58 PM
David Littlewood
Guest
n/a Posts
Re: Good quality 80mm lathe chucks, machine vices and tools for a Hobbymat MD65?

In article <4f4c1e88$0$18068$c3e8da3$2bd0d6bf@news.astraweb.c om>, Philip
Pemberton <philpem@philpem.me.uk> writes

>Hi all,
>
>Well, my Hobbymat MD65 mini-lathe is doing sterling service now it's been
>treated to a decent "CLA" (clean, lubricate and adjust) session. The
>tailstock jams if you accidentally pull it in past zero and there's a bit
>of backlash on the horizontal leadscrew, but that's about it. Certainly
>nothing that would prevent it from being used.
>
>Problem is, now I find myself in a predicament: I don't have the external
>jaws for the Polish-made three-jaw Hobbymat chuck... and I need to turn a
>1-5/8in. diameter aluminium rod down to a more reasonable size and put a
>few centred holes in it. Naturally this thing is just slightly too large
>for the internal jaws...
>
>The externals aren't available as a spare part, so I'm looking to get a
>second chuck (possibly two, a 3jaw self-centering and a 4-jaw independent
>plus a dial indicator). You can probably predict my question, but I'll
>ask it anyway... :)
>

Phil,

You might try asking Rotagrip if they can supply external jaws for the
chuck, if there is enough detail of the maker. They proved very
resourceful when I needed some a couple of years ago.

David
--
David Littlewood
Old Feb 28, 2012, 07:15 AM
Alan Dawes
Guest
n/a Posts
Re: Good quality 80mm lathe chucks, machine vices and tools for a Hobbymat MD65?

In article <4f4c1e88$0$18068$c3e8da3$2bd0d6bf@news.astraweb.c om>,
Philip Pemberton <philpem@philpem.me.uk> wrote:

> The standard chuck is an 80mm diameter thing with three M6 bolts
> protruding from the rear face (at 120-degree angles from each other) for
> fixing. These bolts are pushed through the faceplate and secured with
> nuts on the rear. I'd prefer this type of fixing if at all possible;
> installing bolts from the back of the faceplate would be tricky at best
> (and possibly involve at least partly disassembling the spindle section,
> which is Not Fun At All).


> As I recall, the faceplate has six holes drilled into it at various
> spacings. There's a photo here:
> http://www.model-engineer.co.uk/site...photo%201a.jpg


> I have no idea if it'll take the four-screw fittings the four-jaw chucks
> seem to use, but it'll certainly take a chuck with the three-screw mount.



> I've also read that it's possible to install a 100mm chuck using an
> adapter backplate, so that's another possibility (if I can find a
> suitable backplate).


It looks as if the chucks that fit the Chinese mini-lathes would fit your
machine. I have bought a selection of chucks (self centring and
independent) both 80mm and 100mm with adaptor from ArcEuro and have not
had any problems with their accuracy, eg see the selection on:
http://www.arceurotrade.co.uk/Catalo...ck-Accessories

Give them a ring on 011626955693, I've always found Ketan to be very
helpful.

Alan

--
alan.dawes@argonet.co.uk
alan.dawes@riscos.org
Using an Acorn RiscPC
Old Feb 28, 2012, 07:35 AM
Roger Woollett
Guest
n/a Posts
Re: Good quality 80mm lathe chucks, machine vices and tools for a Hobbymat MD65?

> The standard chuck is an 80mm diameter thing with three M6 bolts

> protruding from the rear face (at 120-degree angles from each other) for
> fixing.


If the new chuck requires bolts get some M6 socket set screws (grub screws)
of suitable length and use them as studs. Works well on the SMEE training
lathe supplies by Arc Euro.--

Regards
Roger Woollett


"Philip Pemberton" <philpem@philpem.me.uk> wrote in message
news:4f4c1e88$0$18068$c3e8da3$2bd0d6bf@news.astraw eb.com...

> Hi all,
>
> Well, my Hobbymat MD65 mini-lathe is doing sterling service now it's been
> treated to a decent "CLA" (clean, lubricate and adjust) session. The
> tailstock jams if you accidentally pull it in past zero and there's a bit
> of backlash on the horizontal leadscrew, but that's about it. Certainly
> nothing that would prevent it from being used.
>
> Problem is, now I find myself in a predicament: I don't have the external
> jaws for the Polish-made three-jaw Hobbymat chuck... and I need to turn a
> 1-5/8in. diameter aluminium rod down to a more reasonable size and put a
> few centred holes in it. Naturally this thing is just slightly too large
> for the internal jaws...
>
> The externals aren't available as a spare part, so I'm looking to get a
> second chuck (possibly two, a 3jaw self-centering and a 4-jaw independent
> plus a dial indicator). You can probably predict my question, but I'll
> ask it anyway... :)
>
>
> Can anyone suggest a decent quality chuck for my MD65?
>
>
> The standard chuck is an 80mm diameter thing with three M6 bolts
> protruding from the rear face (at 120-degree angles from each other) for
> fixing. These bolts are pushed through the faceplate and secured with
> nuts on the rear. I'd prefer this type of fixing if at all possible;
> installing bolts from the back of the faceplate would be tricky at best
> (and possibly involve at least partly disassembling the spindle section,
> which is Not Fun At All).
>
> As I recall, the faceplate has six holes drilled into it at various
> spacings. There's a photo here:
> http://www.model-engineer.co.uk/site...ms/42726/photo
> %201a.jpg
>
> I have no idea if it'll take the four-screw fittings the four-jaw chucks
> seem to use, but it'll certainly take a chuck with the three-screw mount.
>
>
> I've also read that it's possible to install a 100mm chuck using an
> adapter backplate, so that's another possibility (if I can find a
> suitable backplate).
>
>
> I've been looking at three chucks --
> Chronos - "Imported" chucks and "Soba" branded
> RDG - HBM? (Indian made apparently, and AIUI not very good quality)
>
>
> Does anyone have any experiences with these? Are they up to much, or
> should I be looking elsewhere?
>
> I'm also after a suitable machine vice for the milling bracket -- the
> manual specifies "50mm opening" but says nothing about the mounting
> requirements. So if anyone can suggest a reasonably good quality machine
> vice suitable for an MD65, I'd appreciate it if you could share the
> details with me :)
>
> Lastly, I'd appreciate it if someone could suggest some decent turning
> tools. I've used the Soba ones from Chronos (the ones which come in the
> blue plastic box) but haven't had much luck with them.
>
> Thanks,
> --
> Phil.
> philpem@philpem.me.uk
> http://www.philpem.me.uk/
Old Feb 28, 2012, 08:02 AM
Jim Wilkins
Guest
n/a Posts
Re: Good quality 80mm lathe chucks, machine vices and tools for a Hobbymat MD65?

"Philip Pemberton" <philpem@philpem.me.uk> wrote in message
news:4f4c1e88$0$18068$c3e8da3$2bd0d6bf@news.astraw eb.com...

> Hi all,...
> Problem is, now I find myself in a predicament: I don't have the
> external
> jaws for the Polish-made three-jaw Hobbymat chuck... and I need to
> turn a
> 1-5/8in. diameter aluminium rod down to a more reasonable size and
> put a
> few centred holes in it. Naturally this thing is just slightly too
> large
> for the internal jaws......
> Phil.


Could you turn one end between centers to fit the chuck?

jsw
Old Mar 03, 2012, 07:37 AM
Philip Pemberton
Guest
n/a Posts
Re: Good quality 80mm lathe chucks, machine vices and tools for a Hobbymat MD65?

On Tue, 28 Feb 2012 08:02:25 -0500, Jim Wilkins wrote:


> Could you turn one end between centers to fit the chuck?


Unfortunately I don't have a dead centre, only a live centre.

I suppose I could make one, though I think my only spare piece of steel
round bar is slightly two small to make a suitably sized Morse taper for
the headstock.

Thanks,
--
Phil.
philpem@philpem.me.uk
http://www.philpem.me.uk/
Old Mar 03, 2012, 07:38 AM
Philip Pemberton
Guest
n/a Posts
Re: Good quality 80mm lathe chucks, machine vices and tools for a Hobbymat MD65?

On Tue, 28 Feb 2012 12:15:30 +0000, Alan Dawes wrote:


> It looks as if the chucks that fit the Chinese mini-lathes would fit
> your machine. I have bought a selection of chucks (self centring and
> independent) both 80mm and 100mm with adaptor from ArcEuro and have not
> had any problems with their accuracy, eg see the selection on:
> http://www.arceurotrade.co.uk/Catalo...sories/Lathes/

Model-C3-Mini-Lathe/C3-Super-C3-Mini-Lathe-Accessories/C3-Super-C3-
Headstock-Accessories

>
> Give them a ring on 011626955693, I've always found Ketan to be very
> helpful.


Looks like that's two suggestions for the Arc Euro chucks then :)

I'll be having a word with them and Rotagrip on Monday morning.

Thanks!
--
Phil.
philpem@philpem.me.uk
http://www.philpem.me.uk/
Old Mar 03, 2012, 07:48 AM
Richard Edwards
Guest
n/a Posts
Re: Good quality 80mm lathe chucks, machine vices and tools for a Hobbymat MD65?

On 03/03/2012 12:37, Philip Pemberton wrote:

> On Tue, 28 Feb 2012 08:02:25 -0500, Jim Wilkins wrote:
>

>> Could you turn one end between centers to fit the chuck?

>
> Unfortunately I don't have a dead centre, only a live centre.
>
> I suppose I could make one, though I think my only spare piece of steel
> round bar is slightly two small to make a suitably sized Morse taper for
> the headstock.
>
> Thanks,


Just stick a bit of bar in the chuck and turn the 60 degree centre. Use
right angle type dog and drive off the chuck jaw face.

--
Richard
Old Mar 03, 2012, 11:26 AM
Jim Wilkins
Guest
n/a Posts
Re: Good quality 80mm lathe chucks, machine vices and tools for a Hobbymat MD65?

"Richard Edwards" <poundeater@blueyonder.co.uk> wrote in message
news:9rei91FgqbU1@mid.individual.net...

> On 03/03/2012 12:37, Philip Pemberton wrote:

>> On Tue, 28 Feb 2012 08:02:25 -0500, Jim Wilkins wrote:
>>

>
> Just stick a bit of bar in the chuck and turn the 60 degree centre.
> Use right angle type dog and drive off the chuck jaw face.
> Richard


Or even lots of cloth adhesive tape around the bar and the chuck.

jsw
Old Mar 04, 2012, 06:31 AM
Alan Dawes
Guest
n/a Posts
Re: Good quality 80mm lathe chucks, machine vices and tools for a Hobbymat MD65?

In article <4f4c1e88$0$18068$c3e8da3$2bd0d6bf@news.astraweb.c om>,
Philip Pemberton <philpem@philpem.me.uk> wrote:

> Problem is, now I find myself in a predicament: I don't have the
> external jaws for the Polish-made three-jaw Hobbymat chuck... and I
> need to turn a 1-5/8in. diameter aluminium rod down to a more
> reasonable size and put a few centred holes in it. Naturally this thing
> is just slightly too large for the internal jaws...


Until you can get some new jaws or chuck, why not file 3 flats on the end
of the rod so that it can be held in the chuck (assuming the rod is longer
than the finished item), put a centre in the tailstock and then turn down
the rod to size. Hopefully it will now have a small enough radius so that
you can reverse it and it will fit the chuck.

Alan

--
alan.dawes@argonet.co.uk
alan.dawes@riscos.org
Using an Acorn RiscPC
Old Mar 04, 2012, 06:38 AM
Mark Rand
Guest
n/a Posts
Re: Good quality 80mm lathe chucks, machine vices and tools for a Hobbymat MD65?

On 03 Mar 2012 12:37:34 GMT, Philip Pemberton <philpem@philpem.me.uk> wrote:


>On Tue, 28 Feb 2012 08:02:25 -0500, Jim Wilkins wrote:
>

>> Could you turn one end between centers to fit the chuck?

>
>Unfortunately I don't have a dead centre, only a live centre.
>
>I suppose I could make one, though I think my only spare piece of steel
>round bar is slightly two small to make a suitably sized Morse taper for
>the headstock.
>
>Thanks,




Just a minor point (although it gets me extremely worked up)...

A dead centre is one that stays stationary, while the work rotates on it.
Normally hardened.

A live centre is one that rotates with the work. Normally soft and in the
headstock.

A rotating centre is one that has bearings so that it can act as a live centre
whilst mounted in a stationary fixture (e.g.. the tailstock).

Mark Rand
RTFM
Old Mar 04, 2012, 04:09 PM
Peter Fairbrother
Guest
n/a Posts
Re: Good quality 80mm lathe chucks, machine vices and tools for a Hobbymat MD65?

Mark Rand wrote:


> Just a minor point (although it gets me extremely worked up)...
>
> A dead centre is one that stays stationary, while the work rotates on it.
> Normally hardened.
>
> A live centre is one that rotates with the work. Normally soft and in the
> headstock.
>
> A rotating centre is one that has bearings so that it can act as a live centre
> whilst mounted in a stationary fixture (e.g.. the tailstock).



So, if I'm turning between center and I take a center (a morse taper
shaft with a point on it) and put it in the headstock, it's a live
center - and if I put the same bit of metal (center) in the tailstock
it's a dead center?

I see your point, but this may be one of those situations where even if
you're right, you're still wrong ...


-- Peter Fairbrother
Old Mar 04, 2012, 06:35 PM
Mark Rand
Guest
n/a Posts
Re: Good quality 80mm lathe chucks, machine vices and tools for a Hobbymat MD65?

On Sun, 04 Mar 2012 21:09:42 +0000, Peter Fairbrother <zenadsl6186@zen.co.uk>
wrote:



>So, if I'm turning between center and I take a center (a morse taper
>shaft with a point on it) and put it in the headstock, it's a live
>center - and if I put the same bit of metal (center) in the tailstock
>it's a dead center?
>


That's exactly it :-) It's not the thing, it's what it's doing!


If one were shopping for the item or labeling the boxes in the stores in the
days before the language got debased, one would have hard centres; soft
centres and rotating centres.

Simples :-)

Only problem is that since so few people do turning between centres these
days, no one seems to sell soft centres any more any one needs to make them
out of a bit of bar or a blank arbour.

Note:- the reason for the live centre being soft is so that one can true it up
after inserting in the headstock.


Mark Rand
RTFM
Old Mar 04, 2012, 07:21 PM
Jim Wilkins
Guest
n/a Posts
Re: Good quality 80mm lathe chucks, machine vices and tools for a Hobbymat MD65?

"Mark Rand" <randm@internettie.co.uk> wrote in message
news:jdu7l7l4brfmojss1s1lnktups7j32li01@4ax.com...

> ...
> Note:- the reason for the live centre being soft is so that one can
> true it up
> after inserting in the headstock.
> Mark Rand


Or after using it to center punch the workpiece.
 


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