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Messages - ggallant571

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1
General Discussion / Re: How long does shipping take from GearBest?
« on: January 21, 2017, 08:51:41 PM »
You don't boil pot.

2
General Discussion / Re: laser to work distance
« on: January 21, 2017, 08:49:47 PM »
Most white material is difficult to burn. Printer paper being the exception. Trusty admin has a list of materials that can be laser cut.

3
Assembly Help / Re: Wiring home switches
« on: January 21, 2017, 08:46:29 PM »
Just did a google search and ebay is about 1/4 the amazon price when including shipping. Wonder if there is a difference.

4
Assembly Help / Re: Wiring home switches
« on: January 21, 2017, 07:56:14 PM »
@ThothLoki - Thanks for posting the Nano adapters. Just ordered a couple. Look perfect for prototyping.

5
General Discussion / Re: How long does shipping take from GearBest?
« on: January 21, 2017, 07:49:47 PM »
My order from GearBest took 1 day from China to Cincinnati OH USA where it sat for 11 days awaiting "My customs agent". Then it took 8 days to travel from Ohio to Maine. I now automatically route all email from GearBest to the trash.

6
General Discussion / Re: laser to work distance
« on: January 21, 2017, 07:41:18 PM »
There definitely is. Unfortunately it depends on both the laser and the lens. My stock lens is about 150mm while the replacement G2 is about 45mm. Suggest you reask with some specifics of your setup.

7
Trouble Shooting / Re: T2laser and Makeblock xy plotter with TTL laser
« on: January 21, 2017, 12:59:34 PM »
From what I read about the A4988 drivers you lose the microstep position on reset.

8
Trouble Shooting / Re: X Axis is Wobbly
« on: January 21, 2017, 12:56:07 PM »
I find that the cheap 3x5 inch (100x150mm) Neon colored index cards are great for burning test patterns. The color burns with very low laser power and the inner layer shows nicely. I bought 100 for $0.89US at the local Walmart. Noticed the same product at stationary stores. Great for testing both vectors and rasters.

9
Assembly Help / Re: Wiring home switches
« on: January 21, 2017, 12:48:41 PM »
Buy an L8 or build one of my DLCM boards. They have headers.

10
Trouble Shooting / Re: T2laser and Makeblock xy plotter with TTL laser
« on: January 21, 2017, 10:17:29 AM »
I have not observed any problems but think you may have detected a possible weakness. If the stepper drivers get reset then I would expect them to "jump" to a full step on restart. Wonder if this can be fixed by moving the motors off the HOME position by a small amount (1mm) and force resetting the drivers. Then enabling them and using this as home. I do not know how to measure.

BTW, it may not be an issue if the default behavior is always the same.

11
You will have to solder to the Arduino Nano pins. You can wire in parallel or individual I/O. You then need to build the firmware to match. Using one switch per axis is typically referred to as homing whereas 2 switches per axis as limits.

12
BenCutLaser / Re: What's the Number One DXF File Problem? (OPEN)
« on: January 20, 2017, 03:48:25 PM »
I think you and Zax deserve Sainthood for the diligent work and quick responses.

Have been bit by the "units" this week. In the end it was my problem. My fatal word is "Assume".

A few comments with no priority:

1. We place a lot of trust in software tools. I use linux (25 years)
    and expect that the user community will detect and fix errors. Apparently
    this is not applicable to graphic arts or laser tools.

2. We tend to link multiple (export/import) files trusting the exported to "do it right"
    and the importer to check and provide nice descriptive error messages.

3. Tools change and the auto updates can large and taken for granted.

4. Every large application has bugs. Fixing a bug that a user has a "work around"
    can be worse than the original.

5. Once something is assumed working (my downfall) it is often easier to blame the
    current or newest change to be the problem when in reality the problem has been
    there all along looking for the best moment to cause grief.

6. Murphy was right.

7. Learning 3 new applications, with 3 different got ya's, at the same time is mind boggling.
    We typically work solo without anyone to provide real time reality checks. I can propagate
    and defend mistakes.

8. CNC machining for the hobbyist is in its infancy. We have not had any type of industry fallout
    where the weak and crappy tools get junked. I don't think we can even buy a book.

9. It  doesn't help that much of the hardware is marginal sold by non-human entities with no
    manuals or tech support. What percentage of our group joined with a statement similar to:

   "I bought the XYZ laser etcher from ABC and it doesn't work"

13
General Discussion / Re: inkscape export
« on: January 20, 2017, 01:38:58 PM »
I think the problem has just been exposed. There are quite a few postings on this site dealing with unspecified units or incorrectly formatted image files.

My next step will be seeing if inkscape has a configuration file where the default units can be set to mm. Baring that, I will write something to process svg files and apply "mm" if the units are not supplied.

14
General Discussion / Re: Another Newbie waiting for Laser to Arrive
« on: January 20, 2017, 11:55:54 AM »
It must be your brain cells get clearer with beer. It really is this confusing!

15
General Discussion / Re: inkscape export
« on: January 20, 2017, 11:52:40 AM »
Adding "mm" to width & height on original svg file seems to help inkscape.

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