CNC me do - Teh Forum

From:	Chris (CHRISSS)	20 Feb 2015 10:41
To:	koswix	30 of 68

41397.30 In reply to 41397.29
And still useless at maths. Or was that a typo? Me

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From:	Monsoir (PILOTDAN)	20 Feb 2015 11:05
To:	ALL	31 of 68

41397.31
This thread reminds me that I need to grab some spares for my MIG. It's been years since I've welded, but I was doing okay at the time. Dan Herman

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From:	johngti_mk-ii	20 Feb 2015 11:10
To:	Chris (CHRISSS)	32 of 68

41397.32 In reply to 41397.30
There's definitely a typo in one of the messages. Unless time is measured differently in Scottish Add THE VETOES to your myspace friends!!! Pretty please :D

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From:	koswix	20 Feb 2015 14:50
To:	Chris (CHRISSS)	33 of 68

41397.33 In reply to 41397.30

/you/ are pulling me up on a typo? Oh the irony.


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If Feds call you and say something bad on me, it may prove what I said are truth, they are afraid of it.

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From:	Chris (CHRISSS)	20 Feb 2015 17:09
To:	koswix	34 of 68

41397.34 In reply to 41397.33
Hahaha. Fair point. I think I'm doing better recently. Me

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From:	koswix	23 Feb 2015 16:22
To:	koswix	35 of 68

41397.35 In reply to 41397.1

Got my stepper motors today. Don't have the proper drivers yet so only running them at 750mA (instead of 4.5A) but even at that piddly current I can't stall them by hand. Well impressed.

CNC4You Nema 23 3.1Nm stepper motors: http://youtu.be/4ZhwKfWf3iY


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If Feds call you and say something bad on me, it may prove what I said are truth, they are afraid of it.

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From:	ANT_THOMAS	23 Feb 2015 16:28
To:	koswix	36 of 68

41397.36 In reply to 41397.35
The stepper motors are for controlling the movements along the axes? Have you bought a router for it yet? ┌─────┐ │ │ │ ┌─┐ │ │ │ │ │ │ └─┘ │ │ │ │ ┌─┐ │ │ │ │ │ │ │ │ │ └─┘ └─┘

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From:	koswix	23 Feb 2015 20:05
To:	ANT_THOMAS	37 of 68

41397.37 In reply to 41397.36
Yup, steppers for x, y and z axis. Would have made more sense to get a smaller one for the z, but the three were together in bundle for a nice price. The cutting head is going to be kind of modular. Probably start with one of my face dremels and upgrade as I learn more about how to use it. I'd love one of those 3kW water cooled spindles on aliexpress. Or a plasma cutter! ▪ ┌────┐ ┌────┐ │ │ │ │ ▪ │ └────┘ │ │ ──┐ ┌── │ ▪ ┌──────┤ ▪ ▪ │ ┌┘ │ │ ▪ ┌─┤ └──┐ │ │ ┌──┘ │ │ │ ││ ││ │ ┌─┐ │ │ └─┼┤ └┴─┴───┘ │ │ │ ─┘│ │ │ │ ┌──────┐ └┬──────────┘ │ │ │ │ │ │ │ │ └───┘ └───┘ If Feds call you and say something bad on me, it may prove what I said are truth, they are afraid of it.

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From:	Killamarshian (HAL9001)	24 Feb 2015 19:30
To:	koswix	38 of 68

41397.38 In reply to 41397.37
Sounds promising. I have been modelling on NX for most of the day, designing a bracket for our new force monitoring equipment.

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From:	koswix	24 Feb 2015 19:36
To:	koswix	39 of 68

41397.39 In reply to 41397.37

I have no idea what a face dremel, but it sounds painful.


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If Feds call you and say something bad on me, it may prove what I said are truth, they are afraid of it.

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From:	koswix	24 Feb 2015 19:45
To:	Killamarshian (HAL9001)	40 of 68

41397.40 In reply to 41397.38

NX scares me. We have to use its little brother, Solid Edge, at uni and that's frustrating enough. Especially as they never actually teach us properly, so you end up having to work stuff out by yourself and invariably this leads to learning to do things the wrong way, or leaving big gaps in your knowledge.


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If Feds call you and say something bad on me, it may prove what I said are truth, they are afraid of it.

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From:	Killamarshian (HAL9001)	24 Feb 2015 21:56
To:	koswix	41 of 68

41397.41 In reply to 41397.40
I am teaching NX8.5 to our engineers next week. Having proper training makes huge difference.

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From:	koswix	24 Feb 2015 22:59
To:	Killamarshian (HAL9001)	42 of 68

41397.42 In reply to 41397.41

I'll give that a watch tomorrow.


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If Feds call you and say something bad on me, it may prove what I said are truth, they are afraid of it.

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From:	Ken (SHIELDSIT)	1 Mar 2015 22:05
To:	koswix	43 of 68

41397.43 In reply to 41397.1
I am getting ready to do this as well. I am using an old table as my starting point. It's about 4' x 4', I want a decent size working area. I'm going to be using a Dremel as the cutting tool and an Arduino as the controller. I have a lot of the parts I need already, but I'm only in the hunting, gathering phase right now. I have two stepper motors but I don't know if they will work yet. I have a parts list started and am getting ready to start buying/making the needed things and get this project going! I am going to do a time lapse of the project if I can get my camera to cooperate. How is yours coming along? ------------------------------------------------------------------------ If you don't like donut, then leave it alone. Nobody force you to eat it.

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From:	koswix	1 Mar 2015 23:01
To:	Ken (SHIELDSIT)	44 of 68

41397.44 In reply to 41397.43

No progress, the real world has been getting in the way. Still waiting for my motor drivers to turn up. Still. Need to order my linear rails. Still need to grind my shirty welds off. Still need to finish designing the y and z axes.


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If Feds call you and say something bad on me, it may prove what I said are truth, they are afraid of it.

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From:	Ken (SHIELDSIT)	1 Mar 2015 23:05
To:	koswix	45 of 68

41397.45 In reply to 41397.44
That's what keeps happening to me. Sounds like a Matchbox 20 song. ------------------------------------------------------------------------ If you don't like donut, then leave it alone. Nobody force you to eat it.

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From:	koswix	2 Mar 2015 09:46
To:	Ken (SHIELDSIT)	46 of 68

41397.46 In reply to 41397.45

Well today is the last day of the 'expected delivery' time frame on ebay for my stepper drivers. Shame they only got dispatched at 3am. From Hong Kong.


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If Feds call you and say something bad on me, it may prove what I said are truth, they are afraid of it.

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From:	Ken (SHIELDSIT)	2 Mar 2015 11:31
To:	koswix	47 of 68

41397.47 In reply to 41397.46
That sucks. I have a digital soldering station I'm waiting on but I'd say with the weather it won't arrive today. Is there a place that suggests what steppers to use? I have two from printers or something, I think they will work for this project but I'm not sure. ------------------------------------------------------------------------ If you don't like donut, then leave it alone. Nobody force you to eat it.

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From:	koswix	2 Mar 2015 12:28
To:	Ken (SHIELDSIT)	48 of 68

41397.48 In reply to 41397.47
I highly doubt that steppers harvested from printers will have enough grunt to run a CNC mill. They'd probably manage a laser cutter gantry, as long as it was light weight. I've also found (although this might be because the printers I nicked mine from are /old/) that printer steppers are relatively low resolution, at 7.2 degrees/step. The printers tend to use a gearbox to increase resolution, but for a CNC extra gearing means extra backlash and should ideally be avoided (Backlash can be compensated for in software to an extend, but if you want decent repeatability it's best to minimise it from the outset) . General rule of thumb (can't remember where I got this or how valid it is...) is you want at least 1Nm to be able to use a dremel effectively to cut wood. The motors I've just received are 3.1 Nm, cost about £30 each and they need a hefty 5 amp driver. In terms of how much torque you need: to cut a straight line in the X axis, you need enough grunt to both move the y/z gantry and enough left over to push the tool through the material. Additionally, your y/z motors need enough torque to prevent the tool deviating in either of those two directions. It soon mounts up to needing quite a bit of force. Furthermore, when you look at a stepper motor torque rating what you get given is the holding torque - i.e. how much torque it has to hold its position. As the RPM of the motor increases, the torque decreases. If you use microstepping you can also reduce the available torque by a large chunk. Also also, there is seemingly no properly reliable way to calculate a linear force from a screw torque. Due to the number of variables in a setup (particularly the friction between your screw and nut), the normal formulas used can be out by 25% or more. Some US building code I saw says that if a particular clamping force is required, you must measure it directly with a strain gauge rather than using a formula to find out how much torque to put on a bolt. ▪ ┌────┐ ┌────┐ │ │ │ │ ▪ │ └────┘ │ │ ──┐ ┌── │ ▪ ┌──────┤ ▪ ▪ │ ┌┘ │ │ ▪ ┌─┤ └──┐ │ │ ┌──┘ │ │ │ ││ ││ │ ┌─┐ │ │ └─┼┤ └┴─┴───┘ │ │ │ ─┘│ │ │ │ ┌──────┐ └┬──────────┘ │ │ │ │ │ │ │ │ └───┘ └───┘ If Feds call you and say something bad on me, it may prove what I said are truth, they are afraid of it.

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From:	Ken (SHIELDSIT)	2 Mar 2015 12:33
To:	koswix	49 of 68

41397.49 In reply to 41397.48
If you don't mind and have time can you point me to some of the guides you consider the better ones for this project? And link me to the motors you ended up buying? ------------------------------------------------------------------------ If you don't like donut, then leave it alone. Nobody force you to eat it.

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