Looking for high RPM DC motor - fabrication of PCB milling machine

[wired!]

I'm currently working on a project to convert a standard HP7470A pen plotter (see http://www.youtube.com/watch?v=Y_1XpCJqpr8 for video) into a PCB milling machine. This will mean no more troublesome film printing, exposing, developing and etching just to make a circuit board.

As the 0.2 mm milling tool requires a high RPM motor (> 42,000 RPM) in order to cut at a maximum speed of 38 cm/sec (provided by the plotter), I am sourcing out such a motor ...

1) Is this motor recommended for the purpose?
http://www.jethobby.com.sg/cgi-bin/e...&cid=20&idx=11

2) As the given KV value is 5300, is it right to say that at 12 VDC (and with a good forced cooling system for the motor), I will get a maximum of 5300×12=63,600 RPM at no load condition?

[headspeed]

Very good idea indeed. But nowaday the PCB circuitry line is about 0.1mm width and the spacing between two lines can be like 0.2mm to 0.5mm. I don't think milling can acheive this. Not to mention the signal integrity is the utmost sought thing in a PCB.

[Artyspec]

SHS is selling the same motor for $62.40

[wired!]

Thanks for all the replies so far, they have been helpful.

I will be getting this 7800 KV brushless motor:

http://shop.rotor.com.sg/show-detail.asp?prodid={B37C0605-907B-4E6E-9C90-3AEA90499C0D}

as well as this high speed micro servo to replace the slow solenoid:

http://www.jethobby.com.sg/cgi-bin/ezsite/prod/manager.cgi?action=show&pid=635&cid=45&idx=1

I tried using a motor running at 30,000 rpm (loaded speed) and the tool keeps breaking ... but if I run anything above 38,000 rpm it mills cleanly without breaking. That's weird.

[mill-on]

Low cost PCB milling machine

Hi,

Thought you might be interested in this:

‘Profiler’ milling machine from a kit

The kit consists of:
- all mechanical parts and the stepper motors
- the driver electronics on two assembled and tested boards
- connectors, mains transformer and connection material
- a standard Ferm FCT300 multi-tool (spindle motor function) and the matching bracket
- system software with an extensive user interface and a conversion utility for PCB layouts (Gerber file reading)
Note: gross weight of parcel(s) approx. 40 kgs.

The complete kit is now available at these prices: *
UK mainland: £ 1163 (£ 1099 + £ 62 courier delivery)
in euros: € 1692 (€ 1599 + €93)
Northern Ireland: £ 1174 (£ 1099 + £ 75 courier delivery)
in euros: € 1709 (€ 1599 + € 110)


Weblink:

http://www.elektor-electronics.co.uk/Default.aspx?tabid=141