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Member postings for Martyn K

Here is a list of all the postings Martyn K has made in our forums. Click on a thread name to jump to the thread.

Thread: I hope to assemble a laser cutter/engraver
18/01/2020 11:44:13

I know what you mean. Its a very strange way of operating. There were no lock nuts in my kit..

Thread: 7 Day challenge Nigel Hawes 30" Tucano...............
18/01/2020 11:42:37

Regarding the reading... Many years ago (about 30), as an up and coming young manager I was sent on a document assimilation course.. i.e. speed reading. Our instructor was a remarkable John Cleese double - although slightly shorter. We were shown how to take in (absorb) documents, one sentence, then a paragraph then a page at a time. Within 3 days my reading rate had gone from about 200 words per minute - which wasn't bad to 22,000 words a minute and I was understanding and remembering more. At the finale I read "3 men in a Boat" in 22 minutes and I can still remember discreet paragraphs of it now. We were tested on the book content - specifically events, names and places. It wasn't enjoyable reading and it was very hard work, headache inducing, but a useful skill to have.

I think I would prefer to build. Watching and good luck..

Martyn

Thread: I hope to assemble a laser cutter/engraver
17/01/2020 23:03:55

Regarding the nuts, two different thicknesses of nuts are supplied. Half nuts are used in the extrusions, full nuts everywhere else

17/01/2020 23:01:44

Regarding the sacrificial sheet. I use 12mm ply. Th reason is to get the wood nearer the laser. Not too close or you will get problems focussing the laser.

Martyn

Thread: Trendsetters and Iconic Models over the Years?
17/01/2020 22:55:53

Wot 4.

Must be zillions of those around

Thread: Cheap Chinese Laser Cutter
17/01/2020 22:53:21

Thanks Andy

That is what I thought. I seem to get a cleaner cut with no smoke present. I think the smoke will be diffusing the light.

Martyn

17/01/2020 17:17:37

I am not actually sure what air assist is. Can someone clarify please?

Thanks

Martyn

15/01/2020 21:22:35

Thanks for that flyingfinn. I still need ťo update the firmware and retry. I'll try and get that done this weekend.

I have photographed some of the modifications

The obvious one is that I have reduced the width of the machine do that the cut width is now 250mm. The beams were cut from the front and the plastic legs moved to the side. This has given me a nice manual home with the laser Pointing within the cut area at 0,0.

dsc_1480.jpg

You can see from this photo there is a piano wire rail. This is to help prevent the cables falling on the bed. It has made a big difference. I am going to add a second rail above the controller and laser psu.

The tool is screwed down to a piece of 400mm x 1000mm conto shelf board and my sacrificial panel is 12mm builders ply screwed to that. There are two guides that I push the wood into to locate consistently.

dsc_1477.jpg

A small £4 fish tank aerator is fitted at the back. This provides more than an adequate supply of air to diffuse the smoke. It will also blow away any small waste that has been cut as well.

dsc_1478.jpg

The pump is held in place using double sided sticky pads which damp the vibration nicely. The feed to the laser head is by clear pvc tbe using a swinging arm. The final feed is length of brass tube with the air outlet about 6mm from the laser focus. You can see this in the first photo. The arm is 10g piano wire in a brass tube bearing located in a home made 3d printed support.

The little pump claims to be 1.5 l per minute output.

Simple mods but it is now much nicer. Reducing the width and screwing it to the baseboard have made it much stiffer.

Martyn

14/01/2020 16:18:05

Thanks FF

See below..

; LightBurn 0.9.07
; GRBL-M3 (1.1e or earlier) device profile, current position
G00 G17 G40 G21 G54
G91
; Cut @ 1800 mm/min, 80% power
M8
M5
G0X-21.5Y16.69
M3
G1Y0.66S800F1800
M5
G0X-10.8Y-1.36
M3
G1X-1.84Y-0.1
M5
G0X0.26Y0.01
M3
G1X0.6Y0.04
M5
G0X-0.3Y-0.02
M3
G1X0.01Y2.72
G1X-2.55Y0.26
G1X-0.01Y-3.13
M5
G0X-0.65Y-0.04
M3
G1Y-2.19
G1X11.36
G1Y2.89
M5
G0X3.3Y12.08
M3
G1Y0.66
M5
G0X-10.79Y-1.36
M3
G1X-1.84Y-0.1
M5
G0X0.26Y0.01
M3
G1X0.6Y0.04
M5
G0X-0.3Y-0.02
M3
G1X0.01Y2.72
G1X-2.55Y0.26
G1X-0.02Y-3.13
M5
G0X-0.65Y-0.04
M3
G1Y-2.18
G1X11.36
G1Y2.88
M5
G0X4.54Y20.44
M3
G1Y0.66
M5
G0X-10.8Y-1.36
M3
G1X-1.84Y-0.1
M5
G0X0.26Y0.01
M3
G1X0.6Y0.04
M5
G0X-0.3Y-0.02
M3
G1X0.01Y2.72
G1X-2.55Y0.26
G1X-0.01Y-3.13
M5
G0X-0.65Y-0.04
M3
G1Y-2.19
G1X11.36
G1Y2.89
M5
G0X3.3Y12.08
M3
G1Y0.66
M5
G0X-10.79Y-1.36
M3
G1X-1.84Y-0.1
M5
G0X0.26Y0.01
M3
G1X0.6Y0.04
M5
G0X-0.3Y-0.02
M3
G1X0.01Y2.72
G1X-2.55Y0.26
G1X-0.02Y-3.13
M5
G0X-0.65Y-0.04
M3
G1Y-2.18
G1X11.36
G1Y2.88
M5
G0X-25.93Y1.21
M3
G1X-0.03Y-0.34
G1X-0.1Y-0.31
G1X-0.16Y-0.28
G1X-0.2Y-0.25
G1X-0.25Y-0.2
G1X-0.28Y-0.16
G1X-0.31Y-0.09
G1X-0.34Y-0.04
G1X-0.33Y0.04
G1X-0.31Y0.09
G1X-0.29Y0.16
G1X-0.24Y0.2
G1X-0.21Y0.25
G1X-0.15Y0.28
G1X-0.1Y0.31
G1X-0.03Y0.34
G1X0.03Y0.33
G1X0.1Y0.32
G1X0.15Y0.28
G1X0.21Y0.25
G1X0.24Y0.2
G1X0.29Y0.15
G1X0.31Y0.1
G1X0.33Y0.03
G1X0.34Y-0.03
G1X0.31Y-0.1
G1X0.28Y-0.15
G1X0.25Y-0.2
G1X0.2Y-0.25
G1X0.16Y-0.28
G1X0.1Y-0.32
G1X0.03Y-0.33
M5
G0X-10.95Y0.17
M3
G1X-0.04Y-0.42
G1X-0.13Y-0.39
G1X-0.19Y-0.35
G1X-0.25Y-0.31
G1X-0.31Y-0.25
G1X-0.35Y-0.19
G1X-0.39Y-0.12
G1X-0.42Y-0.04
G1X-0.41Y0.04
G1X-0.39Y0.12
G1X-0.36Y0.19
G1X-0.3Y0.25
G1X-0.26Y0.31
G1X-0.19Y0.35
G1X-0.12Y0.39
G1X-0.04Y0.42
G1X0.04Y0.42
G1X0.12Y0.39
G1X0.19Y0.35
G1X0.26Y0.31
G1X0.3Y0.25
G1X0.36Y0.19
G1X0.39Y0.12
G1X0.41Y0.04
G1X0.42Y-0.04
G1X0.39Y-0.12
G1X0.35Y-0.19
G1X0.31Y-0.25
G1X0.25Y-0.31
G1X0.19Y-0.35
G1X0.13Y-0.39
G1X0.04Y-0.42
M5
G0X-1.05Y-9.79

13/01/2020 14:01:46

Hi FlyingFinn

Many thanks for your help. I have established that my controller does not accept the M04 command. Unfortunately. M04 was introduced or fixed (I think) with GRBL version 1.1f. Unfortunately, my firmware is at 1.1e...

Modifying the gcode, replacing M03 with M04 resulted in the laser simply running at about 20% power, it didn't change in intensity and it didnt even mark the wood.. .

I have sort of got round it by putting the corners on a different layer and running them at reduced power, not totally satisfactory but I am not getting any fires now...

Martyn

10/01/2020 12:52:23

Thanks.

So how do I switch M4 on? I thought the $ commands were the M code instructions.

09/01/2020 21:21:26

Fitted my little pump tonight and it does keep the smoke away. Quite pleased with that.

I do have a problem though. I am trying to cut very light 1/32 balsa and it keeps burning.

I have switched on laser mode. $32=1 and then enabled laser level ramping $4=1 which is meant to reduce power at corners (think stringers slots) which is where the fires start. Now, setting $4=1 in non laser mode disables the steppers which is what is happening.

it appears as though the controller does not recognise laser mode.

Anyone got any ideas? I am wasting a lot of wood trying to get this sorted.

thanks

Martyb

08/01/2020 20:09:46

My little pump claims to be 1.5 l/min. Just a waft of air to clear the smoke. If its not enough I'll go for something a little larger.

Martyn

08/01/2020 16:36:34

Hi Andy

I bought a very cheap low air throughput pump from a fleabay Chinese supplier for about £4. It works ok but I need to plumb it in properly. As I use my laser to cut tissue, I don't want a big draught, just a gentle waft to remove the smoke.

I'll let you know how I get on. My laser is in bits at the moment for mods - fitting this is one of them.

Martyn

Thread: Forum 2020 Mass Build discussion.
07/01/2020 13:18:08

I'll be creating my own thread Lucas.

 

Still not sure which one to go for. Probably the Provost but still waiting for my Fan to arrive

 

Martyn

Edited By Martyn K on 07/01/2020 13:18:20

Thread: 1/3 Fly Baby
30/12/2019 11:27:32

That's a lovely paint job. Well done

Thread: Forum 2020 Mass Build discussion.
20/12/2019 13:49:22

Sites like outer one and aerofred sell advertising space. Many of the links are labelled download but are almost certainly not what you expect, usually some genuine utility software, occasionally, malware.

I accidently accidently downloaded and installed some virus scan tool from one of the big suppliers which was a real pain to get rid of.

Have we got a definitive answer on the mass build choice yet. Only 11 days to 1st January. I don't think that anything will take over the TN minijets and there are enough raking part to make it worthwhile.

Martyn

Thread: PSSA Mass Build weekend attenders
18/12/2019 22:52:22

Unfortunately, I may not be able to make it as its only 2 days before I disappear on holiday for 3 and a bit weeks. If I can make it, it will be Saturday only and I can almost guarantee a light easterly on that day

Thread: Forum 2020 Mass Build discussion.
18/12/2019 22:48:42

EDF jets is OK with me. EDF on order and ready to make a start, Not sure which one to build though.

 

TBH, its what the mass build was originally all about, a quick, cheap and cheerful build. What is there not to like about it..

 

Martin C, my RCM&E arrived earlier this week.

 

Martyn

Edited By Martyn K on 18/12/2019 22:50:01

Thread: Chris McG F-86 Sabre Dog build blog
18/12/2019 12:25:46

Mine has gone straight into the rudder (or will do when I get round to gluing it). It does make sense to increase the contact area between torque rod assembly and rudder so fitting into a short length of nylon tubing would be a good idea. I may just do that myself now..

I extended my rudder by 3mm (a spruce strip) at the TE. This adds a little extra strength and offer a bit of ding proof. Something my models tend to need.

Martyn

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