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Author Topic: Boxford Tooling Plate, 4th Axis & CoolJet  (Read 7999 times)

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Offline SimonD

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Boxford Tooling Plate, 4th Axis & CoolJet
« on: April 12, 2009, 01:03:23 PM »
Seeing all the other 4th axis on here, I thought I would show my rendition of one, along with the tooling plate and CoolJet I made for my Boxford 190VMC.



Offline budman68

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Re: Boxford Tooling Plate, 4th Axis & CoolJet
« Reply #1 on: April 12, 2009, 01:20:36 PM »
Very nice, could you be a little more detailed about your cool jet setup?

Thanks for sharing-
Dave
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Offline SimonD

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Re: Boxford Tooling Plate, 4th Axis & CoolJet
« Reply #2 on: April 12, 2009, 01:29:04 PM »
The CoolJet is similar in concept to this patent...
http://www.google.com/patents?vid=USPAT5390854&id=khscAAAAEBAJ&printsec=drawing&zoom=4&dq=5390854#PPA2,M1

The coolant and air is supplied at the same pressure to the nozzle and mixes together so you get fine dropplets in the air stream. The adjuster regulates the amount of liquid in the airstream.
I have made it also remotely adjustable using a RC servo. That way when the machine does a toolchange it can move itself out of the way of the toolchanger and return to the correct position for the specific tool.

Thanks
Simon

Offline budman68

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Re: Boxford Tooling Plate, 4th Axis & CoolJet
« Reply #3 on: April 12, 2009, 01:31:55 PM »
Interesting. Thanks -  :)

dave
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Offline Tweakie.CNC

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Re: Boxford Tooling Plate, 4th Axis & CoolJet
« Reply #4 on: April 14, 2009, 09:29:12 AM »
Hi Simon,

Is the 4th axis belt driven ? and what is the reduction ratio please.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline SimonD

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Re: Boxford Tooling Plate, 4th Axis & CoolJet
« Reply #5 on: April 14, 2009, 12:43:08 PM »
Tweakie,

Yes the 4th axis is belt driven. The ratio is 32:10 Not ideal but the biggest ratio I could get in the small space.

Simon

Offline Dan13

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Re: Boxford Tooling Plate, 4th Axis & CoolJet
« Reply #6 on: April 17, 2009, 08:10:24 AM »
Hi Simon,

Nice work! Did you make the 4th axis from scratch? How about sharing some details about how you made it? Is it stepper driven? what is the max RPM?

Did you make the spindle yourself? Did you use angular contact ball bearings?

Have you tried it yet? What is held in the collet there?

What is the table travel of your Boxford?

Thanks.
Daniel

Offline SimonD

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Re: Boxford Tooling Plate, 4th Axis & CoolJet
« Reply #7 on: April 17, 2009, 03:01:27 PM »
Daniel,

Yes the 4th axis is made from scratch.
It is stepper driven through a 32 - 10 belt drive.
The spindle is a genuine cheap copy of an ER20 2 Morse Taper Collet Chuck (£5 from eBay)
The bearings are Deep groove Radial 6804-2RS bearings, I didn't need a lot of preload so deep groove bearings are perfectly adequate.

I don't use it as a spindle but as a rotary indexer and so have not tried it at speed. I guess it will be limited by the kernal frequency... 200 steps * 10 microstepping * 3.2 ratio = 6400 steps per rev. at 25khz that would be 234 rpm

I have attached a pic of the axis "transparent" so you can see the inside.

Yes I have used it extensively and have not found any problems with it. The stepper is pretty weak but that is to be expected. It is fine for cutting but does not have the power to hold the collet chuck in place while you try and ram the main spindle into it (Yes, it has tried it on a particularly odd hiccup) it just freewheels which is quite nice as it saved the chuck.

In the collet is just a small fixture I use for making RC Helicopter Rotor Cores, a picture of which can be seen here along side the plastic part it replaces.... http://www.byte-sized.com/ebay/DF4_Core_Both.jpg
To give an idea of scale, it is made from 1/2" bar.

The travel on the Boxford is 190mm in X and ~125mm in Y

Thanks
Simon
Re: Boxford Tooling Plate, 4th Axis & CoolJet
« Reply #8 on: April 17, 2009, 05:02:38 PM »
I fly a DF4 & a Walkera 36. Nice job on the rotor core.

Offline SimonD

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Re: Boxford Tooling Plate, 4th Axis & CoolJet
« Reply #9 on: April 17, 2009, 06:06:21 PM »
I fly a DF4 & a Walkera 36. Nice job on the rotor core.
Thanks... My DF4 is pretty non-standard now. It even has a complete CNC'd head and 2.4Ghz receiver. The frame and main motor is original though  ;D
If you still run the plastic DF4 core and want an Ally one, give me a shout.