[chbot] Laser cutter controller board

Mon Apr 30 22:43:14 BST 2018

Thickest I have tried was 9mm MDF. It cut that at 90% power @ 2mm/s. Have only cut 6mm Perspex at 65%. 

Also found this Arduino shield specifically for the K40 laser retrofit from Oz. https://awesome.tech/buy-gerbil/

While we on laser cutters anyone know of a good (cheap) carbon filter to stop my neighbours getting my laser smoke?

Cheers

-----Original Message-----
From: Chchrobotics <chchrobotics-bounces at lists.ourshack.com> On Behalf Of chchrobotics-request at lists.ourshack.com
Sent: Monday, 30 April 2018 11:00 PM
To: chchrobotics at lists.ourshack.com
Subject: Chchrobotics Digest, Vol 127, Issue 21

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Today's Topics:

   1. Laser cutter controller board (Jody Hann)
   2. Re: Laser cutter controller board (Mark Atherton)
   3. Re: SD cards... (hamster)

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Message: 1
Date: Mon, 30 Apr 2018 08:59:58 +1200
From: "Jody Hann" <jbh at xtra.co.nz>
To: <chchrobotics at lists.ourshack.com>
Subject: [chbot] Laser cutter controller board
Message-ID: <000a01d3dffd$0a365850$1ea308f0$@xtra.co.nz>
Content-Type: text/plain; charset="utf-8"

I imported a laser cutter
(https://www.aliexpress.com/item/Freeshipping-Co2-4040-laser-engraving-machi
ne-cutter-machine-CNC-laser-engraver-DIY-laser-marking-machine-carving/32716
404961.html?spm=a2g0s.9042311.0.0.C9PeIi) and am very happy with it. Great machine for the price.

I have been using K40 whisperer with it rather than the awful software that came with it. This software and the laser control board doesn't support laser level control so can't laser in grey scale.

I found a direct replacement for the m2-nano control board that is in my laser. It is http://cohesion3d.com/cohesion3d-mini/.

Has anyone used this board or suggest another board to enable greyscale engraving? Would be nice to have a direct drop in replacement board than spend time rewiring etc.

Cheers

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Message: 2
Date: Mon, 30 Apr 2018 09:06:06 +1200
From: Mark Atherton <markaren1 at xtra.co.nz>
To: chchrobotics at lists.ourshack.com
Subject: Re: [chbot] Laser cutter controller board
Message-ID: <d7bee2a5-945a-314e-3ebd-5449ae6a9675 at xtra.co.nz>
Content-Type: text/plain; charset="windows-1252"; Format="flowed"

Hi Jody,

Any idea what thickness acrylic or MDF you can cut with it ?

-Mark

On 30/04/2018 8:59 AM, Jody Hann wrote:
>
> I imported a laser cutter
> (https://www.aliexpress.com/item/Freeshipping-Co2-4040-laser-engraving
> -machine-cutter-machine-CNC-laser-engraver-DIY-laser-marking-machine-c
> arving/32716404961.html?spm=a2g0s.9042311.0.0.C9PeIi)
> and am very happy with it. Great machine for the price.
>
> I have been using K40 whisperer with it rather than the awful software 
> that came with it. This software and the laser control board doesn’t 
> support laser level control so can’t laser in grey scale.
>
> I found a direct replacement for the m2-nano control board that is in 
> my laser. It is http://cohesion3d.com/cohesion3d-mini/.
>
> Has anyone used this board or suggest another board to enable 
> greyscale engraving? Would be nice to have a direct drop in 
> replacement board than spend time rewiring etc.
>
> Cheers
>

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Message: 3
Date: Mon, 30 Apr 2018 11:09:41 +1200
From: hamster <hamster at snap.net.nz>
To: Christchurch Robotics <chchrobotics at lists.ourshack.com>
Subject: Re: [chbot] SD cards...
Message-ID: <d4dddae4e7ea15c195f0b4b88b50545d at snap.net.nz>
Content-Type: text/plain; charset="utf-8"

You detect only the tiniest bit sarcasm for pointing out that every silver lining (cheap uSD) has a cloud (low write speeds). I am pretty sure that everybody knows that an inexpensive uSD card is a inexpensive SD card, and you have to pay for performance. 

But I was not sure that
everybody knows about the "UHS Speed class mark" (aka "number in a
bucket") that indicates the guaranteed write speed for SD cards, in tens of MB/s. So far from the write performance being unspecified it is clearly indicated on the card itself (if anything in a tiny logo on a uSD card can be considered clearly indicated!). 

I didn't know about
the new "Vnn" mark (where 'nn' is the guaranteed write speed in MB/s) till I just looked at https://www.sdcard.org/developers/overview/speed_class/ - obviously a new attempt at confusing consumers :-). 

Mike 

On 29.04.2018 20:07,
Volker Kuhlmann wrote: 

> On Sun 29 Apr 2018 19:42:10 NZST +1200,
Michael Field wrote:
> 
>> You could always instead pay $89.90 for a
32GB SanDisk card with the '3 in a bucket' logo (30MB/s) if write performance is important to you.
> 
> That would be somewhat daft.
> 
>
I just paid $31.50 for a 16GB Sandisk ExtremePro 90MB/s write speed
>
(special order but available), big enough for many RPi applications and
> I don't waste my time over $14.50,
> $31 for 32GB Sandisk Extreme
60MB/s write speed,
> $39 for 64GB Samsung EVO plus 60MB/s write speed,
because the specs are
> good and it's cheap so why not check it out.
>
All PB Tech Easter special.
> 
> Am I detecting a bit of sarcasm in your
reply which I think is misplaced
> here, or am I being overly sensitive?
I pointed out a factor to
> consider. I didn't tell anyone what they
should or should not do with or
> for their applications.
> 
> Volker

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