CNC'ing a small lathe - pimping the unpimpable...

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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby PK » Mon Jun 27, 2011 7:41 pm

air.command wrote:Very nice work there Nic! :D Do you think you'll need to add a cover for the belt to stop the swarf getting into the belt or pulleys?

How your setup deals with swarf, and how it manages/protects cables are two of the important things that make the difference between a lash up and a workhorse machine. I reckon it's really worth putting the effort in..

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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby Sumo310 » Mon Jun 27, 2011 8:48 pm

Looking good :)


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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby ogivemeahome » Tue Jun 28, 2011 1:27 pm

cryoscum wrote:the HDPE gets 'unpredictable' when it gets too thin - tip got buggered.


Are you using coolant? If not, maybe employ a heatsink (small centre hole, insert copper or aluminium
with thermal paste)?

Great posts btw.
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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby PK » Tue Jun 28, 2011 1:32 pm

cryoscum wrote:the HDPE gets 'unpredictable' when it gets too thin - tip got buggered.

Sharp tools, low backrake (2-5 deg) so they don't bite.
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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby cryoscum » Sat Jul 02, 2011 7:29 pm

Hi All

After many drinks and lots of crap talking, here's the first fully complete nose cone, 29mm dia, 0.8mm uniform thickness cross spooled continuous carbon strand and West System R105/H206. Weighs 10g.

1.JPG
1.JPG (57.81 KiB) Viewed 2676 times

2.JPG
2.JPG (40.15 KiB) Viewed 2676 times


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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby strud » Sat Jul 02, 2011 8:06 pm

Bloody awesome Nic !

When you say spooled, do you mean wound from a filament on the lathe ?

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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby PK » Sat Jul 02, 2011 8:13 pm

:-)

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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby cryoscum » Sat Jul 02, 2011 8:22 pm

Hi Craig

Yep, thats it. Got a roll of carbon filament from CG Composites some time ago. Wound it up onto the 28.2mm OD HDPE cone, fully wetted through with epoxy and ensuring that the 'weave' strands were diagonally across each other, going back and forth several times. Once cured I machined it again to the 0.8mm thickness. It is tremendously rigid for its thickness.

Will also try a 38mm cone soon...

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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby kopius » Sun Jul 03, 2011 5:54 pm

It's actually rough as guts!! no actually... that was simon the next day! haha

The cones looks awesome and I think this is just the beginning. Nic has done a fantastic job so far!

Don't ask what that 29mm cone is worth though ;-)
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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby cryoscum » Sun Jul 03, 2011 10:16 pm

Hi All

Here's the 38mm NC. I extended the NC's base to include about 70mm of BT to accommodate the AV bay, all nice and monolithic.
The mandrel was cut from 40 dia HDPE and then laid up with CF and West epoxy. Some pics
1.JPG
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2.JPG
2.JPG (40.11 KiB) Viewed 2621 times

3.JPG
3.JPG (39.16 KiB) Viewed 2621 times

4.JPG

5.JPG
5.JPG (41.17 KiB) Viewed 2621 times

Once cured I machined the NC again leaving it 1mm thick and weighing 40g.
6.JPG
6.JPG (47.76 KiB) Viewed 2621 times

I would imagine this one won't break off at mach 2.2...
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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby cha05cat » Mon Jul 04, 2011 12:17 pm

I think you will need to look towards building for mach 3 not mach 2.2!!!!

Looks great though! Well done
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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby rocket_troy » Tue Jul 05, 2011 10:35 am

Nice Job!

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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby cryoscum » Wed Jul 20, 2011 8:17 pm

Gents, write this down somewhere: Bundy + Radius Mode = Not good. Use Diameter Mode in conjunction with Bundy...
You'll agree when you get there...
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Total impulse for 2015: 84,231 Ns
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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby RobAust » Wed Jul 20, 2011 8:55 pm

Hey Nic,

I wrote it down, now what do I do with it ?

While where writing things down, try this one "triangle of 165 laid over the nosecone mold leaves air bubbles....." I attempted to lay-up the 38MM NC mold and ended up with air bubbles, I could fill it with epoxy. However, i'm going to have another go with a different weave pattern, i'n convinced this can be sorted. Will show you what I mean.

By the way, in my experience most things ending with Bundy normally ends bad !

Regards,
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Re: CNC'ing a small lathe - pimping the unpimpable...

Postby PK » Wed Jul 20, 2011 10:17 pm

cryoscum wrote:Gents, write this down somewhere: Bundy + Radius Mode = Not good. Use Diameter Mode in conjunction with Bundy...
You'll agree when you get there...

Remember to double the steps per on X.
PK


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