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Topics - carolynsdad

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Laser Accessories / A Laser Lens Adjustment Solution
« on: March 23, 2017, 02:54:24 PM »
I have seen clever ideas for enhancing the way in which the lens focus ring can be turned more easily but they rely on having a 3D printer which I do not have. So here's my solution that only requires four holes to be drilled in the knurled ring (I took them to the same depth as the the thread) and four pins (I made mine from an unwanted indoor TV aerial!). I drilled the holes using a Dremel on a drill press and ensured the holes gave an interference fit.  I pushed the pins in using a gentle tap with a hammer to start them then pressed fully home in a vice.

The end result means you can have a fairly precise measure of how much to rotate the lens by for multiple cuts in plywood and if a very fine adjustment is want a tube of suitable dimensions can be slipped over a pin.  Of course I did fully tape up the lens both ends and the thread.

My engineering might not be the best but it works for this 3.5W laser, it took 30 minutes to achive and it is free.

Mike

2
General Discussion / A3 End Plates
« on: February 22, 2017, 03:22:17 AM »
Our A3 machine has Y axis end plates that carry five wheels (see photo) where the two on the bottom are placed close together instead being inline with the two outer top ones.

The carriage has a terrible amount of play; it can be rocked just over 1mm on the top wheel which translates to significant laser dot position movement .

I cannot understand why the design placed the lower wheel where they did, exacerbating the effect of free play, and to make matters worse cut off some of the acrylic preventing a new hole from being drilled. Anyone in UK making replacements with that lower right wheel moved below the upper one?

I suppose I could cut off the piece with the lower hole and make an adjustable plate to reposition it ... now there's a thought!

An additional point is that the top central wheel seems to be rather pointless as it will almost certainly not be touching the track or be adding friction. I see that in a Banggood video that haven't fitted it.

Mike

I forgot to add the photograph, here it is.

3
Laser Modules / 3.5W Laser Head with TTL Driver
« on: January 07, 2017, 04:47:13 AM »
I wonder if any members have purchased the 3.5W laser and TTL controller/constant current source from Bangood? Mine arrived from China yesterday.

http://www.banggood.com/450nm-3500mW-3_5W-Blue-Laser-Module-With-TTL-Modulation-for-DIY-Laser-Cutter-Engraver-p-1103261.html

I have powered the TTL board from the 12V connector on the L2 Eleks board and picked up the TTL signal from D11 (0.9 position) under the Arduino and removed the link.

Using T2Laser I can turn the TTL pin on and off getting a good 4.8V with it on and 0.1V with the TTL off. Also the fan is running when the L2 is powered  but the laser is not functioning. There is no voltage at the laser output from the TTL board either on or off load when the TTL signal is active.

Any shared  experiences would be welcome.

Mike

4
General Discussion / 40W CO2 Laser at a low price
« on: October 11, 2016, 11:54:47 PM »
There seem to a lot of people in the US selling small 40W CO2 laser kit a a low price; anyone here taking a punt at one?
This seems to be the lowest price at an amazing low price of US $294.00: see on eBay at http://tinyurl.com/jjaxyxa

Mike

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Benbox / Benbox - No do not write it off!
« on: October 06, 2016, 11:17:02 PM »
Depending on what you want to achieve Benbox might be all you need as these results by my daughter show.

Her coloured work is on 4mm birch plywood coated with water-based fence stain (Cuprinol Shades); her customers are delighted.
Her settings were
Speed - 800
Time - 10
Scan by line
Continuous

I haven't asked her what settings she used on the keyring or hammers but I can find out if you are interested.

No reason why anyone else shouldn't get good results with Benbox.

Mike

7
Spare Parts Sources / Laser Fan
« on: May 19, 2016, 10:30:54 PM »
I wonder if the connector on this 40mm fan fits the sockets on the Eleks boards?  At just 3.99 and post free in UK it is a great price for a spare laser module fan.

http://www.ebay.co.uk/itm/3D-Printer-2pin-12V-DC-40x40x10mm-Cooling-Fan-Hotend-Extruder-RepRap-Prusa-/121805540666?hash=item1c5c2d0d3a:g:eCUAAOSwXj5XGISo

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Spare Parts Sources / Stepper Motor Drivers
« on: May 17, 2016, 01:21:55 AM »

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General Questions / Eleks Maker board
« on: March 25, 2016, 05:40:39 PM »
I see there are two versions of the Eleks Maker board; this is an L1 whereas I have an L2 from Benbox. The immediately noticeable difference is the the MP2307 constant current source board - with trimmer resistor and a device in the MOS position  The L2 only has what looks like an 8A  9W thyristor (LR7843 - M503?). This is the L2

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