Ok but there must be room for the bicycles

[cb4]

After my wife uttered these words I'm finally able to go ahead and build the machine that will make all my dreams come true (my dreams are full of mdf dust.)

It will be a medium sized gantry router that will use the shed walls for support
about 1.5m by 2m about (5 feet by 6.5)




The support beams are going to be 40/40/2 welded steel box profile
The rails are going to be supported rails with lineair slides
For the motion I was planning to go with a 2NM motors and a trapezium screw and nut configuration. (later upgrade to ballscrew)

I was planning on first building the metal bits and then buying a package of drivers motors and breakout board.

The machine must be able to machine aluminium and wood

I was happily boring friends and relative with my ideas until I showed them to a helpful cnc company whom mentioned that over 1m the screw and nut configuration was a poor choice and that my engine were to weak. Furthermore he suggested rack & pinion drive and 4.5 NM Steppers.

I would like some advice about what the best course of action would be, I would like to start with a basic machine and upgrade it as I can afford it, increasing it's beefiness and speed as I learn more.

I don't want to start with the best of the best of the most expensive but neither do I want to be stuck with a 1.5 ton shed filling divorce argument that's so inaccurate that I'd be better of routing by hand.

Kind regards

Wouter

[Jesse B]

I would definitely go R&P for a build this size. You'd get significant whipping with screws that long. Talk to Ahren at www.CNCRouterParts.com.

[cb4]

Thanks Jesse

I'll take the advice unfortunately the shiping bill from cnc parts is more than what the parts cost. (I'm Dutch)

I found a Dutch company that offers affordable racks.
http://www.bwklaver.nl/

1m lengths

27.50 for module 1
38 euro's for module 2
and 74 for module 3
excl VAT

I'm still a bit hazy on the subject of modus but I'm looking forward to a long read and a steep learning curve.

I'll keep posted what I do next

[Jesse B]

Thanks Jesse

I'll take the advice unfortunately the shiping bill from cnc parts is more than what the parts cost. (I'm Dutch)

I found a Dutch company that offers affordable racks.
http://www.bwklaver.nl/

Ahh, didn't notice your location. In that case it's up to you to find somebody you'll deal with Good luck with your research, and feel free to ask if you come across more questions.


- Jesse

[cb4]

OK new take

http://www.flickr.com/photos/44365518@N07/4561041286/www.flickr.com/photos/44365518@N07/4561041554/[/IMG]
http://www.flickr.com/photos/44365518@N07/4561041286/www.flickr.com/photos/44365518@N07/4561041470/[/IMG]
http://www.flickr.com/photos/44365518@N07/4561041286/www.flickr.com/photos/44365518@N07/4561041390/[/IMG]
www.flickr.com/photos/44365518@N07/4561041286/in/photostream/[/IMG]


Rack and pinion w split pinion to get rid of backlash

[cb4]

OK I found some nice steppers and drivers

But I wonder which of the motors best fit the driver

If I take the phase inductance root and multiply by 32

Model 34HS9801 34HS9802 34HS9803
optimum voltage 65V 50V 94V

Am I correct in deducing that only the middle one is right for the driver?





CW250AC 2 - Phase Mircostepping MotorDriver

1.power input type:20~43VAC or 24~60VDC
2.Output current:1.5～5A
3.Mircostepping：1(1.8o)、1/2、1/4、1/8、1/16、1/32、1/64、1/128、1/256
1/5、1/10、1/25、1/40、1/50、1/100、1/200
4.Protect form : Overheated protect, lock automatic half current ,error connect protect
5.Dimensions：150mm¡ 98mm¡ 45mm
6.Weight：<600g.



Model 34HS9801
Step Angle(°) 1.8
Motor Length(mm) 98
Rated Current(A) 4
Phase Resistance(Ohm) 0.98
Phase Inductance(mH) 4.1
Holding Torque(N.cm) 490
Detent Torque(N.cm) 9.5
Rotor Inertia(g.cm2) 1.55
Lead Wire(No) 8
Motor Weight(g) 3000

Model 34HS9802
Step Angle(°) 1.8
Motor Length(mm) 98
Rated Current(A) 5
Phase Resistance(Ohm) 0.65
Phase Inductance(mH) 2.4
Holding Torque(N.cm) 490
Detent Torque(N.cm) 9.5
Rotor Inertia(g.cm2) 1.55
Lead Wire(No) 8
Motor Weight(g) 3000

Model 34HS9803
Step Angle(°) 1.8
Motor Length(mm) 98
Rated Current(A) 2.7
Phase Resistance(Ohm) 1.9
Phase Inductance(mH) 8.6
Holding Torque(N.cm) 490
Detent Torque(N.cm) 9.5
Rotor Inertia(g.cm2) 1.55
Lead Wire(No) 8
Motor Weight(g) 3000

[Jesse B]

Well, kind of. That formula is to be used with very high speed machining. You will be able to use any of those motors with that driver with excellent results. You might actually want to go with the 65v or the 94v motor.

Read this post for more info: http://cnczone.com/forums/showpost.p...72&postcount=8

[cb4]

I still have no real clue how the finished machine will look as I can only built what I can scavenge and today I found more stuff.

Unlike people with jobs who can fly in their gears and materials, I'm currently having to make do with a lot of free time a bike and a scrapheap 7km away
Things aren't all bad though a lot of cheap stuff and today I thought I hit pay-dirt, two linear rails about 2m long and in not too bad a shape.

Also two wheels for a belt drive


A mysterious black box with a lot of writing on it


After a rather lengthy ride trough the rain and a warm soapy bath for all of us, I found some damage on both of them. A little wear and tear is to be expected but I wonder if anyone could tell me when this becomes unacceptable.