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  #121  
Old Fri 05 February 2010, 07:13
aniljangra
Just call me: Anil #44
 
Delhi
India
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Yes you can do that. Check "stop CV on" setting.
It switches from CV to exact stop mode depending on the approaching angle in next line of code. Set the angle here
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  #122  
Old Fri 05 February 2010, 07:25
Rad Racer
Just call me: Wayne #25
 
Minnesota
United States of America
Welcome to the club Ries, you have built a great looking machine.

I am looking forward to seeing some of your projects.
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  #123  
Old Fri 05 February 2010, 07:57
KenC
Just call me: Ken
 
Klang
Malaysia
Ries, how did your leadscrew pitch setting went?
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  #124  
Old Fri 05 February 2010, 09:44
riesvantwisk
Just call me: Ries #46
 
Quito
Ecuador
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Anil,

I am not sure I have seen that setting, is this a Gcode function or a Mach3 setting?
Come to think of it, when I issue G64 P0.1, it should follow my lines within 0.1mm and also carve me letters smooth enough, I need to experiments a bit I think...

@Wayne, thanks.. I indeed have that club feeling and very happy with the number and the machine, I got my first RFQ already... and this is just a hobby!

@Ken: I didn't change it yet, My main problem is that my supplier didn't gave me to much specs but it's Module 1, 22 tooth pinion and my teeth are 6mm apart.
From the spreadsheet you send me I cannot makeup in EMC what I should fill in because when I fill in the value the spreedsheet creates, I am simply way off. In this case it usually means I have no idea what I am talking about so I will properly put a bit more trial and error in calibrating the machine rather then doing this scientifically.

Ries
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  #125  
Old Fri 05 February 2010, 20:04
KenC
Just call me: Ken
 
Klang
Malaysia
did you divide the values of step/mm by step/Rev?
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  #126  
Old Fri 05 February 2010, 20:47
riesvantwisk
Just call me: Ries #46
 
Quito
Ecuador
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Ken,

in EMC I need to fill in how much the gantry will move per revolution, and from the current pinion I have no idea how to calculate that, and it doesn't match well with the sheet of gerard, I have properly some weird module, but not 1.5. I did a rough estimate once and based on that I did a bit of trial and error to get closer and closer to the final number, top of my head I set it to 92.xx mm/rev.

If I have the outer diameter of the pinion, and I know the distance between each teeth, wouldn't it then be possible to calculate the movement of my gantry per revolution, this would possible even depend on the type of teeth?? Gosh......

Ries
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  #127  
Old Fri 05 February 2010, 21:53
KenC
Just call me: Ken
 
Klang
Malaysia
Ries,

(Step/mm) / (step/rev) = rev/mm
Which is what EMC2 stepconfig wants to know.


but since you don't know what gear you are using, then I have the Gear dimension formular, hope it helps.
modulegeardata.pdf

Last edited by KenC; Fri 05 February 2010 at 21:57..
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  #128  
Old Sat 06 February 2010, 02:35
aniljangra
Just call me: Anil #44
 
Delhi
India
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Quote:
Originally Posted by riesvantwisk View Post
Anil,
I am not sure I have seen that setting, is this a Gcode function or a Mach3 setting?
That is a setting/function in mach3 .
I was using a simple program "Turbocnc" in past and just now installed EMC on my machine.

I'll post as soon as come across any setting (or another way to do it) that do the same thing as "stop CV on angle" in EMC.
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  #129  
Old Sat 06 February 2010, 07:46
riesvantwisk
Just call me: Ries #46
 
Quito
Ecuador
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Anil,

the guys from EMC did start implementing something like 'stop CV', the idea was to switch to G61 or G61.1 when some angle where sharper then XX degrees. However, this turned out not so reliable because when you have designs with different angles the final output can look weird because of the decisions the machine made during cutting.

What I am planning to use is G64 P0.1, for my letters that gave me very nice results while maintaing cut speed. G 64 p0.1 (in metric mode) simply means follow the line while keeping your velocity but stay accurate within 0.1mm.

The accuracy highly depends on the accel/deacceleration settings of the machine with the maximum speed taken into account. if you don't allow your machine to go fast and acceleration and de-acceleration values are low, then you will not notice this. However, when you have high velocity, then you will see the effect.

Here is the G-Code:
G21
G17
G40
G90
G94 F16000

G61
G0 X0 Y0
o100 call

G64 P0.1
G0 X10 Y10
o100 call

G64 P1
G0 X20 Y20
o100 call

G64 P10
G0 X30 Y30
o100 call
G0 X-10 Y-10
M2

o100 sub
G91
G0 X75 Y0
G1 X-75
G1 Y75
G90
o100 endsub
Attached Images
File Type: png cv.png (13.3 KB, 1330 views)
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  #130  
Old Sat 06 February 2010, 08:29
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Also remember, to cut a sharp inside corner is different from a sharp outside corner. (On an outside corner, the toolpath is allowed a radius movement and the corner is still sharp)
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  #131  
Old Sat 06 February 2010, 10:58
riesvantwisk
Just call me: Ries #46
 
Quito
Ecuador
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Gerald,

you mean during cutter radius compensation, G40, G41 and G42, right ?

I created a little movie with CV mode on and cutter compensation left with a tool diameter of 5 mm, the speed of the tool is not realistic, aswell as the compensations in question for a real machine, it just shows what gerald is mentioning. The white lines do have rounded corners, while the part in question if cut out on your machine will have sharp corners.
The 4 corners still shows with no cutter compensation (left) to 0.1, 1 and 10mm settings.

Movie

note: The blue/green lines show the 'part', the white line shows the planned path, and the red line shows the actual cut path.

PS: It's a nice exercise to understand what's happening and how the machine + control software behaves. I can encourage you all to play with gcode and settings within for some time to get a better understanding.

Ries

Last edited by riesvantwisk; Sat 06 February 2010 at 11:01..
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  #132  
Old Thu 11 February 2010, 15:20
riesvantwisk
Just call me: Ries #46
 
Quito
Ecuador
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Small update,

I decided to add an additional ventilator in my control box to suck in some fresh air through a filter on the top left of my controlbox, and get it out on the bottom right. I had two times my computer shutting down, only when the control box was closed. It's a bit scary aswel, because my router turns on and off quickly for a split second, don't want to have my hands there. I now turn of the router before I change a bit to be sure.

Here is a little video I made during cutting the channel for my hold down system on my spoil board. video
I decided to create the same hold down system as Mark has. Link

Given the a mouth of dust I have seen last Wednesday, next project is going to be a dust foot and dust management, not sure yet if we are going for a cyclone or a bin/bucket cyclone.

Ries
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  #133  
Old Thu 11 February 2010, 19:47
KenC
Just call me: Ken
 
Klang
Malaysia
What sort of ambient temp in Quito? I know its 2000ft above sea level, but is it any cooler then near sea level? I'm asking because I want to know if I must cut a hole on my control box for the fan.
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  #134  
Old Thu 11 February 2010, 21:16
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Ries, you have the computer inside the control box?

The router should not switch on/off if the the PC start/stops - in Mach, the "charge pump" takes care of that. There must be something similar in EMC.
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  #135  
Old Thu 11 February 2010, 21:24
bradm
Just call me: Brad #10
 
Somerville(MA)
United States of America
There is a charge pump function you can configure in EMC. You'll want some lines in your config file similar to these:
Quote:
loadrt charge_pump
net estop-out charge-pump.enable iocontrol.0.user-enable-out
net charge-pump <= charge-pump.out
addf charge-pump base-thread
net charge-pump => parport.0.pin-16-out
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  #136  
Old Fri 12 February 2010, 06:56
riesvantwisk
Just call me: Ries #46
 
Quito
Ecuador
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@Ken,

we are at 2400 meters (7200feet) average temperature during the day is like 24 celcius at 2PM, at the coast it's much warmer (32-35).

@Gerald: my CPU is mounted inside of my controlbox. This works fine untill the temp goes up. When my computer shuts on/off my router goes on for a split second, the router doesn't have time to go to full speed.

@Brad: I do have the CP enable, I am pretty sure of that, but I will check next Saturday to give this a other inspection. I did some test here with my kitchen table project and for example I couldn't jog in stepconf, but it worked fine in Axis.

Theory:
The CP protects you when the computer goes on and off while EMC/Mach3 is not running. THis because the software can properly shutdown and startup the CP
However not during a computer/software crash. I tried to find the CP circuit in the manual, but it's only written is a block diagram. The documentation states "100 Hz minimum square wave on pin 17." I can only imagine the CP is implemented using capacitor/resistor circuit with a hold time of roughly maximal 10ms. So when a computer crashes, or shutsof while EMC/Mach3 is running, it might switch a output for max 100ms because the CP is active.

Tomorrow I give it a quick inspection on the jumper still, can't be sure enough.

Ries
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  #137  
Old Fri 12 February 2010, 08:47
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Yes, there is a short time delay for the capacitor to drain via the resistor, but I thought it was too short to energise the router and the contactor/relay switching the router?
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  #138  
Old Fri 12 February 2010, 11:28
riesvantwisk
Just call me: Ries #46
 
Quito
Ecuador
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Gerald,

I do hear the relays switches very fast, given the nature of a relay (mechanics), this might be just enough to switch on/off very fast. With a solid state relay I might not have this problem because they can switch much faster.

A relay tend to hold itself for a brief moment, something with flux.. Don't remember the terms anymore. But when a coil get's released of it's supply, then the coil lends to hold itself for a moment longer. This will make my router turn, even though the pulse to the relays is only around 10ms.

Ries
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  #139  
Old Sun 14 February 2010, 11:21
riesvantwisk
Just call me: Ries #46
 
Quito
Ecuador
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Small update...

the ventilator and filter in the control box really helped well, the machine has been on for the whole day and didn't shut off, without the extra ventilator and the control box closed this would take around 30-45 minutes and it would shut down, so I think I am good there.

Given the amouth of dust cutting the T slots for the hold down system generated, my next project was creating a dust feet connected to my little vacuum cleaner to see if the initial design worked. I work with a 'iron man', so you see a bit of iron there We where in for a nice surprise, because we forgot how much air the router pushed downward, at first we generated more dust then we sucked up. We solved it by redirecting the air of the router back up with a small 1mm plate directly under the router and opening teh wood. I am going to design a new dust feet now we know that this setup worked. Also notice that the front of the feet can be removed and currently hold by a elastic. THis is going to get changed by a system that I can open and close, so I can start the MM, and if everything looks good I close the dustfeet.
As you notice I use a small hose for the dust feet instead of a big one, the rationale for this is that I wanted to create fast airstream rather then a slow one with a big pipe. I also mounted it on the side instead of the middle to make sure the air swirls around in the dust feed. The size of that pipe is subject to change, but given the <1HP vacuum I have, I though a bigger hose would be less effective here. There is no science behind it, but I just thought this was a good idea.

Also going to make a mini cyclone, size of it would be around 30x48 cm, same smaller size to make sure that the internal airspeed is fast enough for my size vacuum so I can separate wood chips from air effectively, bigger is not always better

Attached some images showing:

1) 15mm MDF close-up to show off cut quality, very happy with that...
2) Dust feet created, this going to get replaced...
3) For Ken I promised a image of my M1 30 200 A A
4) Image of the T channel I created for my hold down system
5) Basic design of the cyclone...
Attached Images
File Type: jpg IMG_0216_small.jpg (52.0 KB, 1206 views)
File Type: jpg IMG_0220_small.jpg (65.0 KB, 1200 views)
File Type: jpg IMG_0215_small.jpg (56.1 KB, 1197 views)
File Type: png cyclone.png (44.9 KB, 1209 views)
File Type: jpg IMG_0212_small.jpg (69.5 KB, 1205 views)

Last edited by riesvantwisk; Sun 14 February 2010 at 11:27..
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  #140  
Old Mon 15 February 2010, 10:41
KenC
Just call me: Ken
 
Klang
Malaysia
Nice work & thanks for the pix.
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  #141  
Old Tue 16 March 2010, 20:40
riesvantwisk
Just call me: Ries #46
 
Quito
Ecuador
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hey Guys,

have haven't been active on my thread for a bit, got new clients for my work that keep me buzy.
Good for getting some $$$ in, bad for mechmate work, so only now once a week at my machine for a moment

Anyways,
I need to by some bits and considering to buy china/japan. I checked some of the bits in the US, europe but they are way to $$$ for me right now. Given also that I am a newbie, I rater buy something cheap now that I can break and play around with, rather then I break 30USD in a snap...

Anyways,
I want to do plyboard cutting and MDF, and also carving. What sort of bits should I have in stock in general?

Ries
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  #142  
Old Tue 23 March 2010, 22:36
dragonfinder1
Just call me: Dave #49
 
Astoria, Oregon
United States of America
I used to buy carbide cutters, spiral cutters when I could find them. That got real expensive in a hurry. I would break one every couple of days or so. Then I went to carbide tipped, but the finish wasn't what I wanted. Then I found Onsrud.com. I started using their HSS series 40-1xx.

I cut mostly soft wood, and the top edge would splinter, so I now use the Downcut for the first cut and then change the cutter to upcut, now I've cut the finishing at least in half. I do a lot of tool changes, but the end result is faster in the long run.

The HSS cutters last longer than the carbide for me because I can run them longer with out breaking the tool.

You can check their web site, I don't know if they ship world wide or not, but their prices are very good.

They do have carbide cutters as well and I may use them once I get real familiar with my machine, but for now it's HSS all the way.
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  #143  
Old Wed 24 March 2010, 19:55
Jason Marsha
Just call me: Jason
 
B'Town
Barbados
Dave,
Why not use a compression cutter that finish in one pass giving a clean bottom and top cut?
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  #144  
Old Wed 24 March 2010, 20:30
sailfl
Just call me: Nils #12
 
Winter Park, FL
United States of America
Dave,

You will get better cuts and the bits will last longer if you use solid carbide bits. If you are breaking so many bits it could be that your feed rate is too fast.
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  #145  
Old Wed 24 March 2010, 21:33
dragonfinder1
Just call me: Dave #49
 
Astoria, Oregon
United States of America
I've thought about compression cutters, I just haven't had the nerve to cut 3/4" wood in one pass. People do it all the time, I just haven't tried it yet.

I'm not breaking cutters because of feeds and speeds, but because of really dumb things that I'm not going to admit to. Solid Carbide spiral cutters are real easy for me to break.

I will start using carbide cutters again one I get to the point I'm really comfortable doing what I'm doing. Until then I'll use the $7 HSS cutters.

As far as the tool changes I do lots of pockets and lots of lettering which requires V Bits. When I do the pockets, I also do the top cut then switch to the upcut cutter. Not all that bad really.
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  #146  
Old Thu 25 March 2010, 00:18
liaoh75
Just call me: David
 
Taibao
Taiwan
Dave,

What size cutter are you using? 1/4, 3/8, or 1/2 inch? I used to have the same problem but after I went up to 12mm (~1/2"), I haven't had a bit break yet. I'm using Solid carbide two flute up cup spirals. Have not looked back since. I still use 6mm (~1/4) on the occasion for things that really need it. Good luck!
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  #147  
Old Thu 25 March 2010, 04:02
sailfl
Just call me: Nils #12
 
Winter Park, FL
United States of America
Dave

It is true you can't beat the price of a $7 bit.
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  #148  
Old Thu 25 March 2010, 10:00
dragonfinder1
Just call me: Dave #49
 
Astoria, Oregon
United States of America
I use mostly 1/4" cutters. I use mostly dimension lumber and come as close to nesting as I can, so any cutter than that won't work. I also use 1/8" and 3/16" cutters plus ( v-bit cutters that are carbide ). I have larger cutters that are carbide and I use them when I can.

My problems are mostly g code errors ( trying to make short cuts ) or pushing the wrong buttons on my hand controller.
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  #149  
Old Mon 26 April 2010, 22:53
riesvantwisk
Just call me: Ries #46
 
Quito
Ecuador
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Looking for a Spindle for Sale in the US, or time to order one from China...

Hey All,

in May I am heading for Dallas for a short period of time and I would have a possibility to buy one of the cheap Chinese spindles.

I now that sumbum had one for sale and I was in contact with him about it, but unfortunately he is out of reach at the moment so I am not sure if he still has it or not.

How long would it generally take to import one of these spindles from China? I have a friend that is willing to receive it for me and I am meeting him in Dallas. on the 22th of May.

Or better, does anybody have one of these spindles + VFD for sale?

Ries
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  #150  
Old Sun 09 May 2010, 10:18
riesvantwisk
Just call me: Ries #46
 
Quito
Ecuador
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Hey All,

here is a little video of my Auto-Z I created yesterday for the Mechmate: http://www.youtube.com/watch?v=s8d1zG0YnIg

The system consists of a little metal box containing a hand full of batteries, a resistor, a LED and a 4n35 opto coupler, this to separate my ground from the BoB's ground to prevent ground loops, high-odd voltages and what not the can be out-there. the PMDX is not well protected so I thought this was a good thing.
The idea was 100% taken from http://wiki.linuxcnc.org/emcinfo.pl?...probe_touchoff and I must say this work just fine!

if anybody is interested in the clp (classic ladder) file, I am more then happy to post by complete config (whish is work in progress... as always here.

Ries

Last edited by riesvantwisk; Sun 09 May 2010 at 10:21..
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