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Member postings for adrian garnham

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

Thread: Cheap Chinese Laser Cutter
29/01/2020 19:37:58

I'm getting good results with this one .... gone down by £10 since I bought it

**LINK**

I'm just getting to grips with the focusing, feed rate, power and air assist but cuts through 3mm soft balsa in 2 passes.

Once I've fully sorted it I'll post some videos etc.

14/01/2020 12:43:00

FlyinFlynn

thank you for your answer (comprehensive as always ) There is a small switch on the laser controller which dims the laser for setup purposes. I have been switching that on and off.

Thread: Home Made CNC/Laser Cutter
14/01/2020 12:39:17

thanks Geoff I'll give that a try

13/01/2020 13:41:13

Hi Geoff

I purchased the same 5W laser module as yourself. I have tested it by manually switching from full power to setup mode and all seems ok.

Can I ask how you connected it to your CNC shield etc ?

Thread: Cheap Chinese Laser Cutter
13/01/2020 13:26:48

FlyinFlynn

thank you. I have A4988 stepper drivers. I have fitted jumpers to all 3 pairs of pins on both x and y (I am not using z at the moment) and changed the steps per mm to 80 ..... everything is now OK

I produced my first test square on cardboard by running the program and manually turning the laser on and off at the corners etc. I haven't figured out how to get the cnc shield talking to the laser yet (my laser is this one **LINK** 

12/01/2020 18:29:48

Thanks Andy

Do I have to set the micro stepping as well ?

12/01/2020 16:01:55

Hi FlyinFlynn

I have designed and built a cantilever type laser cutter similar to yours.

I am using an arduino, cnc shield and 5W laser the same as Geoff Gardiner used in his build.

For software I am using Inkscape (with the laser extension) to create the gcode and Universal Gcode sender to control the steppers and laser.

I haven't turned on the laser yet (too scared lol) but have been playing around with carriage movement, homing etc and noticed that the carriage doesn't seem to be moving the correct distance. I've obviously not set the steps/mm correctly.

I noticed in your previous post .... "The 80 steps per mm is correct if you are using a 1.8 degree per step motor set to x16 and a 20 tooth gt2 pulley

360/1.8 * 16/40 = 80 degrees per motor revolution/degrees per step * microsteps/ mm per pulley revolution"

I am using the motor and belt combination above but could you shed some light on how to set the microstepping to x16 ?

Thread: A different kind of build.
12/12/2019 10:29:54

I have decided to go ahead and build a cantilevered laser cutter along similar lines to this thread.

I have purchased all the mechanical parts and adapted the design to suit my 3d printer which has a max bed size of 120mm cube.

Do you think this laser would be suitable for cutting up to 3mm birch ply https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F123988343347

Any advice would be much appreciated

Thread: Home Made CNC/Laser Cutter
05/12/2019 18:12:29

Geoff

thank you. I wasn't sure if the tolerance of the shaft would be good enough for the bearings.

05/12/2019 17:42:36

Hi Geoff

I'm having trouble finding 12mm rod and lead screws in 1000 mm lengths. Where did you get yours from? I'm assuming china but didn't really want to wait too long for delivery.

22/11/2019 18:16:04

thanks for the detailed reply. That's made my mind up .... definitely going to go for it. I've had a go at Inkscape and it's very similar to the CAD package I used at work before I retired (Creo by PTC) so quite easy to use.

22/11/2019 12:40:11

Geoff

I am seriously thinking of building a laser cutter along similar lines to yours. Just a couple of questions before I get too excited by the prospect:

1. Do you need programming knowledge or does the software do it all ?

2. Are you using Nema 17 steppers or something larger ?

3. Do you think this laser would cut 3mm birch ply **LINK** ?

thanks in advance

Thread: Tony Nijhuis Harvard - Build Log
14/10/2019 19:57:29

Looks great. If mine turns out half as good I'll be well chuffed.

All the wood and electrical stuff has arrived just waiting for the plans ....

BTW what prop have you decided on ?

08/10/2019 21:15:33

I would like to do a build log but will see how it goes

08/10/2019 11:43:07

Thanks Geoff

I've ordered the plans .... can't wait to get started.

08/10/2019 11:43:05

Thanks Geoff

I've ordered the plans .... can't wait to get started.

08/10/2019 11:43:04

Thanks Geoff

I've ordered the plans .... can't wait to get started.

06/10/2019 15:38:25

I am a new member and this is my first post !! This build log and your craftsmanship is second to none , I am about to purchase the harvard plan from Tony Nijhaus designs. Can you tell me what electric setup you have used and what retracts you ended up purchasing ?

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