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Messages - Administrator

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31
Cutting / Re: Small holes problem
« on: January 17, 2017, 04:41:47 PM »
I ordered the 0.8mm as that's the closest to your 1mm that I found.

32
Cutting / Re: Small holes problem
« on: January 17, 2017, 04:33:31 PM »
>Awaiting the Linux versions of BCL and T2Laser.

The best platform to write for that mixture would have been to use Java. But java is a resource hog and very slow...and has other very major problems that I won't go into. Suffice it to say BCL would still be under Development had I chose to write it in Java. It would have been a massive project...which is why it didn't happen in the first place.

The bottom line, as stated in other posts, is that there isn't going to be a Linux version of BCL. So you can stop holding your breath now and breathe normally...!!!

33
Cutting / Re: Small holes problem
« on: January 17, 2017, 03:55:51 PM »
See the product at the top 0.8mm - do you think this is close enough? I can't yet find 1mm Plywood Birch...do you have a URL?

http://www.alwayshobbies.com/materials/wood/plywood/quality-birch-plywood

34
Cutting / Re: Small holes problem
« on: January 17, 2017, 03:34:58 PM »
>What I mean with the beam is returning too quickly, that the time between a time the beam passes a certain spot
>and the next passage not enough time has past. The part is still hot from the previous burn.

Now I understand. A problem with thin wood perhaps. When I get my 1mm Plywood Birch, I will try a lower power setting and a slower speed trying to find the right combination (inc passes) where the wood is cooled enough before the next pass starts over again. This will be trial and error but, as I suspected, for these small holes I will need to create a dedicated laser tool for this job.

35
Cutting / Re: Small holes problem
« on: January 17, 2017, 03:23:30 PM »
Bert,

I'm looking around to order some 1mm Plywood Birch...I want to try cutting your dxf file and see what's going on here.

If BCL is not working for you, then maybe I can modify it so it does -- else I'll tell you how I was able to create the toolpaths to successfully cut the small holes cleanly.

36
Cutting / Re: Small holes problem
« on: January 17, 2017, 02:08:50 PM »
Are these the small holes you are talking about? See attachment.

I guess I'm really am lost Bert...why is it again that you need 100 passes to cut 1mm wood?

>the beam is returning too quickly

What does that mean? I don't understand that statement at all.

37
Cutting / Re: Small holes problem
« on: January 17, 2017, 02:05:43 PM »
Hi Zax,

That is the way BenCutLaser makes its repeats.

Regards,
Bert

I don't think that's true Bert...but admittedly I'm not clear on what and how you are trying to cut this. There is a lot of leeway in how you can setup your toolpaths.

38
You can flash Grbl 1.1e for both T2 and BCL.

39
General Discussion / Re: Upgrade NEJE DK-8-KZ to DK-8-3
« on: January 17, 2017, 11:31:56 AM »
If the ram size on this board (I know nothing about it) is similar to the Nano, you might want to start flashing with 0.9i as it has a slightly (I believe) smaller footprint than 1.1e. The is that tests out ok and works, then you can try 1.1e and test with that firmware.

40
Cutting / Re: Small holes problem
« on: January 17, 2017, 10:58:30 AM »
Bert,

Is the small hole burning issue from the laser beam being turned off and back on again? I can see how that would be the case. Send me your dxf file so I can look at it and see how these objects are positioned and their sequence.

I'm still of the belief that you don't have to do all that manual work to get the gcode to work (not burn the small holes)...I'm still thinking if you create your toolpaths correctly, it will will work/should work.

Let me see your dxf file and give me a shot at saving you some time. If I can't, then my lost time, not yours...!!!

41
General Discussion / Re: Upgrade NEJE DK-8-KZ to DK-8-3
« on: January 17, 2017, 10:53:47 AM »
Same here Bert...!!!

42
General Discussion / Re: Closed loop Nema17
« on: January 17, 2017, 10:50:33 AM »
>I have not looked in BCL or T2Laser to see if they have a similar function.

BCL does have that, but I recently deactivated XYZ real time feed back positioning display for the following reasons:

1. As you said, there is noticeable lag in fetching the XYZ positioning data.
2. To obtain accurate, real time feedback requires:
--priority CPU time processing the returned data (this priority has to be higher than gcode processing priority which is undesirable).
--low powered PCs such as tablets and notebooks (I have several different kinds to test with) simply do not have the horse power to do this. This is the main problem.
3. Additional Grbl overhead complexity to parse the returned data string format based on which version of Grbl you are using. As more and more firmware is added, more coding has to be added to parse the firmware data string correctly.

All in all, I feel on these low powered laser machines with unknown PC CPU power, I have come to the conclusion that displaying the real time position of the XYZ axis, while nice to have, is not 'mandatory' to have.

The very highest CPU priority needs to be on:
--processing the gcode.
--sending the gcode to the controller board.
--checking the gcode return status from the controller board.

My testing has shown that on low powered PCs, to handle the gcode sending/status receiving AND to process the real time XYZ axis data at the same time, simply bogs down the PC CPU. Thus, I have made the decision to deactivate this feature in BCL.

43
General Discussion / Re: Closed loop Nema17
« on: January 17, 2017, 09:00:16 AM »
There are two major classes of laser machines:

1. The low powered laser machines that this forum is all about.

2. The more powerful CO2 (gas) lasers. I'm ignoring the really expensive and really powerful Fiber, Crystal and Plasma industrial lasers.

The more powerful CO2 lasers are expensive, ranging from, perhaps a cheap kit for roughly $750.00 to well over $10,000.00+. The more expensive machines have all of these bells and whistles and they also have very to extremely expensive CAM software.

If a company were to add this kind of stepper motor to a 'low cost', low powered laser machine, I don't think it would be 'low cost' anymore. As @Lob0426 indicated, some software programming and testing would be needed.

I'm not sure from reading this post that you realize that...maybe you do. But my point is, and I could be off base here, is that you're just thinking out loud of how nice it would be if our machines has this kind of stepper -- but -- I think to engineer that into our kind of DIY kits would drive up the cost, perhaps, too much.

Just my 2 cents.

44
Laser Accessories / Re: A Better Belt Anchor
« on: January 16, 2017, 07:49:20 PM »
I am...I just printed a set today for a forum member. However, I'm afraid it isn't cost-effective for me to ship outside of the US. Forum members who are in the US, the shipping is reasonable, but to ship outside of the US the cost is almost as much as I charge for a set of 6 belt anchors.

I can get a shipping quote for you, but I'm pretty sure you won't like it.

Let me know if you want to shipping quote.

Thanks...

45
Gantry Systems / Re: SiXYLaser
« on: January 16, 2017, 03:30:11 PM »
Ahhh I think it depends on what you're trying to test. I downloaded the dxf file but would not open in QCAD, LibreCAD, DoubleCAD or BCL. Well, I thought, of all the nerve!!

With multiple attempts, I was finally able to open it in BCL and have a look at all the drawing objects. This is not a suitable test dxf file for BCL in my opinion, because:

1. It contains too many drawing objects (499) with lots and lots of duplicate objects.

2. However -- having said that -- this is a suitable dxf file for performance testing with engraving software such as T2 Laser!!!

3. BCL doesn't engrave (currently) so it can't really performance test the file. About all BCL can do with it is to test that all the drawing objects BCL supports handles them OK in the file. So, with that in mind, I have added the missing drawing objects, mainly formal Single and Multi-line Text objects, Splines and Ellipses. See attachment.

I am in the process of finalizing one optimizing feature within BCL before I do one last Save As and produce an additional test dxf file for BCL, but attached is what I've modified your original file down to for BCL.

As I said, your original file may be perfectly fine for engraving performance testing with T2, but I would do a Save As on it as it does have some internal corruption to it structure. @Zax's dxf optimizer may be able to fix this too.

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