CNC me do - Teh Forum

From:	Killamarshian (HAL9001)	24 Feb 2015 22:56
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.

0/0

Reply Quote

More

From:	koswix	24 Feb 2015 23:59
To:	Killamarshian (HAL9001)	42 of 68

41397.42 In reply to 41397.41

I'll give that a watch tomorrow.


 ▪                    
             ┌────┐    ┌────┐                      
          │    │    │    │ ▪                    
          │    └────┘    │                      
          │   ──┐  ┌──   │ ▪                    
   ┌──────┤    ▪    ▪    │                      
  ┌┘      │              │ ▪                    
┌─┤       └──┐  │  │  ┌──┘                      
│ │          │ ││  ││ │   ┌─┐                   
│ │          └─┼┤  └┴─┴───┘ │                   
│ │           ─┘│           │                   
│ │   ┌──────┐  └┬──────────┘                   
  │   │      │   │                              
  │   │      │   │                              
  └───┘      └───┘

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

0/0

Reply Quote

More

From:	Ken (SHIELDSIT)	1 Mar 2015 23:05
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.

0/0

Reply Quote

More

From:	koswix	2 Mar 2015 00:01
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.


 ▪                    
             ┌────┐    ┌────┐                      
          │    │    │    │ ▪                    
          │    └────┘    │                      
          │   ──┐  ┌──   │ ▪                    
   ┌──────┤    ▪    ▪    │                      
  ┌┘      │              │ ▪                    
┌─┤       └──┐  │  │  ┌──┘                      
│ │          │ ││  ││ │   ┌─┐                   
│ │          └─┼┤  └┴─┴───┘ │                   
│ │           ─┘│           │                   
│ │   ┌──────┐  └┬──────────┘                   
  │   │      │   │                              
  │   │      │   │                              
  └───┘      └───┘

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

0/0

Reply Quote

More

From:	Ken (SHIELDSIT)	2 Mar 2015 00:05
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.

0/0

Reply Quote

More

From:	koswix	2 Mar 2015 10:46
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.


 ▪                    
             ┌────┐    ┌────┐                      
          │    │    │    │ ▪                    
          │    └────┘    │                      
          │   ──┐  ┌──   │ ▪                    
   ┌──────┤    ▪    ▪    │                      
  ┌┘      │              │ ▪                    
┌─┤       └──┐  │  │  ┌──┘                      
│ │          │ ││  ││ │   ┌─┐                   
│ │          └─┼┤  └┴─┴───┘ │                   
│ │           ─┘│           │                   
│ │   ┌──────┐  └┬──────────┘                   
  │   │      │   │                              
  │   │      │   │                              
  └───┘      └───┘

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

0/0

Reply Quote

More

From:	Ken (SHIELDSIT)	2 Mar 2015 12:31
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.

0/0

Reply Quote

More

From:	koswix	2 Mar 2015 13:28
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.

0/0

Reply Quote

More

From:	Ken (SHIELDSIT)	2 Mar 2015 13:33
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.

0/0

Reply Quote

More

From:	koswix	2 Mar 2015 13:43
To:	Ken (SHIELDSIT)	50 of 68

41397.50 In reply to 41397.49
I got these motors: http://www.ebay.co.uk/itm/111412185294?_trksid=p2057872.m2749.l2648&ssPageName=STRK%3AMEBIDX%3AIT I think the guy selling them has a pretty sweet setup - he's put his own stickers on them, with a model number. If you look up the model on alibaba/express there's only one place selling them - for slightly more than this guy is in the UK. I suspect he's struck a deal there, somehow :D Anyway, I think the price is pretty fair - they seem to be very strong (see video up there ^^^ ) and they're dual shaft so I can stick a rotary encoder on the back end for feedback. As for guides, well I've been wanting to do this project for about 6 years or more. I've read countless forum threads, instructables, hackaday articles etc. There's not really any one guide I've followed, more a case of trying to understand the various theories of operation and then design my own system. CNCZone.com is a pretty active forum. To be honest, if I was in teh USA I'd probably just have bought a Shapeoko 2 machine. But the shipping costs to the UK are ridiculous. I think the unit costs about $600 delivered in the US, over here it's about £680 (plus potential import duties etc.) ▪ ┌────┐ ┌────┐ │ │ │ │ ▪ │ └────┘ │ │ ──┐ ┌── │ ▪ ┌──────┤ ▪ ▪ │ ┌┘ │ │ ▪ ┌─┤ └──┐ │ │ ┌──┘ │ │ │ ││ ││ │ ┌─┐ │ │ └─┼┤ └┴─┴───┘ │ │ │ ─┘│ │ │ │ ┌──────┐ └┬──────────┘ │ │ │ │ │ │ │ │ └───┘ └───┘ If Feds call you and say something bad on me, it may prove what I said are truth, they are afraid of it.

0/0

Reply Quote

More

From:	Ken (SHIELDSIT)	2 Mar 2015 15:49
To:	koswix	51 of 68

41397.51 In reply to 41397.50
Good info, thanks! I'm looking/trying to keep this project around the $200 mark. Did I mention I work here? I can probably get a lot of the build material right outside my office. It's mostly just motors/drivers I need assistance with. I'll also be able to get some pretty bad ass bits. Is the number of motors needed 3? ------------------------------------------------------------------------* If you don't like donut, then leave it alone. Nobody force you to eat it.

0/0

Reply Quote

More

From:	koswix	2 Mar 2015 16:07
To:	Ken (SHIELDSIT)	52 of 68

41397.52 In reply to 41397.51
That's awesome if you can steal stuff for it! $200 limit isn't going to get you much otherwise. The biggest costs are the motors, drivers and PSU (I've spent £120 there but I'm banking on using old PC power supplies for free, otherwise that'd be £200), the linear motion stuff (precision linear rails and bearings, I'm planning on spending ~£90), and the lead screw. I'm going to start off with some simple M8 threaded rod as my lead screw, but I'll upgrade it (or a later machine) to a proper ACME rod with a ballscrew at some point - that's going to cost a /lot/. 3 motors minimum? Well you need at least one for each axis you want to move. Sure you can work it out from there! ▪ ┌────┐ ┌────┐ │ │ │ │ ▪ │ └────┘ │ │ ──┐ ┌── │ ▪ ┌──────┤ ▪ ▪ │ ┌┘ │ │ ▪ ┌─┤ └──┐ │ │ ┌──┘ │ │ │ ││ ││ │ ┌─┐ │ │ └─┼┤ └┴─┴───┘ │ │ │ ─┘│ │ │ │ ┌──────┐ └┬──────────┘ │ │ │ │ │ │ │ │ └───┘ └───┘ If Feds call you and say something bad on me, it may prove what I said are truth, they are afraid of it.

0/0

Reply Quote

More

From:	Ken (SHIELDSIT)	2 Mar 2015 17:15
To:	koswix	53 of 68

41397.53 In reply to 41397.52
I found some of these and some bearings so far. I know we have everything to build multiple CNC's because that's what our machines are but probably on a scale far too large for my needs! ------------------------------------------------------------------------ If you don't like donut, then leave it alone. Nobody force you to eat it.
Attachments:

0/0

Reply Quote

More

From:	koswix	2 Mar 2015 18:50
To:	Ken (SHIELDSIT)	54 of 68

41397.54 In reply to 41397.53

They look interesting! Wonder what their inductance is. Also it's got a pulley for a toothed belt - any idea what it came from?


 ▪                    
             ┌────┐    ┌────┐                      
          │    │    │    │ ▪                    
          │    └────┘    │                      
          │   ──┐  ┌──   │ ▪                    
   ┌──────┤    ▪    ▪    │                      
  ┌┘      │              │ ▪                    
┌─┤       └──┐  │  │  ┌──┘                      
│ │          │ ││  ││ │   ┌─┐                   
│ │          └─┼┤  └┴─┴───┘ │                   
│ │           ─┘│           │                   
│ │   ┌──────┐  └┬──────────┘                   
  │   │      │   │                              
  │   │      │   │                              
  └───┘      └───┘

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

0/0

Reply Quote

More

From:	Ken (SHIELDSIT)	2 Mar 2015 19:00
To:	koswix	55 of 68

41397.55 In reply to 41397.54
No, it came from a CNC milling machine of some type. I put my finger in there to show the size of it. It's pretty big. ------------------------------------------------------------------------ If you don't like donut, then leave it alone. Nobody force you to eat it.

0/0

Reply Quote

More

From:	koswix	2 Mar 2015 19:32
To:	Ken (SHIELDSIT)	56 of 68

41397.56 In reply to 41397.55

I'd guess that's a Nema 23 frame, looks roughly the same size as mine.

>>I put my finger in there to show the size of it. It's pretty big.

Said the actress to the bishop.


 ▪                    
             ┌────┐    ┌────┐                      
          │    │    │    │ ▪                    
          │    └────┘    │                      
          │   ──┐  ┌──   │ ▪                    
   ┌──────┤    ▪    ▪    │                      
  ┌┘      │              │ ▪                    
┌─┤       └──┐  │  │  ┌──┘                      
│ │          │ ││  ││ │   ┌─┐                   
│ │          └─┼┤  └┴─┴───┘ │                   
│ │           ─┘│           │                   
│ │   ┌──────┐  └┬──────────┘                   
  │   │      │   │                              
  │   │      │   │                              
  └───┘      └───┘

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

0/0

Reply Quote

More

From:	graphitone	2 Mar 2015 21:39
To:	Ken (SHIELDSIT)	57 of 68

41397.57 In reply to 41397.53
Looks like a hip flask made by engineers, for engineers. Drawings n' that

0/0

Reply Quote

More

From:	99% of gargoyles look like (MR_BASTARD)	2 Mar 2015 23:34
To:	graphitone	58 of 68

41397.58 In reply to 41397.57
So a not-hip flask, then. bastard by name bastard by nature

0/0

Reply Quote

More

From:	Ken (SHIELDSIT)	3 Mar 2015 16:05
To:	koswix	59 of 68

41397.59 In reply to 41397.1
I think I've decided on a design. You might want to check this out. It seems pretty nice and you can download a very detailed build guide here. This manual is on sale at Amazon and B&N for ~$30, or for free on his site, I've never seen that happen before! ------------------------------------------------------------------------ If you don't like donut, then leave it alone. Nobody force you to eat it.

0/0

Reply Quote

More

From:	koswix	3 Mar 2015 20:24
To:	Ken (SHIELDSIT)	60 of 68

41397.60 In reply to 41397.59

That's a nice looking machine. Too big (and expensive) for me, though.


 ▪                    
             ┌────┐    ┌────┐                      
          │    │    │    │ ▪                    
          │    └────┘    │                      
          │   ──┐  ┌──   │ ▪                    
   ┌──────┤    ▪    ▪    │                      
  ┌┘      │              │ ▪                    
┌─┤       └──┐  │  │  ┌──┘                      
│ │          │ ││  ││ │   ┌─┐                   
│ │          └─┼┤  └┴─┴───┘ │                   
│ │           ─┘│           │                   
│ │   ┌──────┐  └┬──────────┘                   
  │   │      │   │                              
  │   │      │   │                              
  └───┘      └───┘

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

0/0

Reply Quote

More