Search found 8 matches

by Meta-Concepts
Fri Nov 04, 2011 1:50 pm
Forum: Help or advice required please
Topic: Vertical Beam Alignment
Replies: 16
Views: 19820

Re: Vertical Beam Alignment

Please feel free to repost. Be aware that some laser diodes don't have a beam that is concentric with the casing. I guess you could convert your machine control to use Mach3, which would give you cutter compensation. That would work fine for vector output, but I haven't looked at how well this would...
by Meta-Concepts
Thu Nov 03, 2011 11:50 pm
Forum: Help or advice required please
Topic: Vertical Beam Alignment
Replies: 16
Views: 19820

Re: Vertical Beam Alignment

Right, enough effing about with bits of masking tape. Here is how to set the laser alignment fast: Go to Maplin and purchase a Green Laser Pointer (A64JK) Get some 21mm diameter Delrin rod or similar. On a lathe, bore out the rod to 13.4mm diameter to fit the laser pointer. If you turn a slightly la...
by Meta-Concepts
Thu Nov 03, 2011 10:23 am
Forum: Help or advice required please
Topic: Vertical Beam Alignment
Replies: 16
Views: 19820

Re: Vertical Beam Alignment

I haven't been given any procedure for adjusting the tube, so I'm not sure how you are defining 'bang on'? Chris leveled the machine when he installed it, but didn't touch the tube. I later noticed that the beam path, whilst making it all the way through the system, was not hitting the middle of the...
by Meta-Concepts
Tue Nov 01, 2011 10:14 pm
Forum: Help or advice required please
Topic: Vertical Beam Alignment
Replies: 16
Views: 19820

Re: Vertical Beam Alignment

Adjusting the final mirror doesn't have any great effect on the beam passing out of the lens. All it does is align the beam with the centre of the lens on the input side, thus ensuring maximum power transmission. If you replace the lens with a paper target, you will see that the beam diameter is nea...
by Meta-Concepts
Mon Oct 31, 2011 10:27 pm
Forum: Help or advice required please
Topic: Vertical Beam Alignment
Replies: 16
Views: 19820

Vertical Beam Alignment

Wasted half a day trying and failing to get my beam aligned perpendicular to the table on this 1290. The beam is off in XZ and YZ planes by about 1mm in 40mm, which is enough to mean that significant features like tab joints are not cutting square or to size. I have tried adjusting the laser tube he...
by Meta-Concepts
Sat Sep 17, 2011 9:23 pm
Forum: General Discussion
Topic: Cloudy residue after engraving cast acrylic
Replies: 7
Views: 15859

Re: Cloudy residue after engraving cast acrylic

Bought some 3mm acrylic from Techsoft and whilst some of what I ordered is branded Perspex, much is unbranded and gives a terrible amount of cloudy residue. I tried a wipe over with Acetone and when I held the job up to the light to check, I was able to watch stress fractures slowly spread across th...
by Meta-Concepts
Sat Sep 17, 2011 8:51 pm
Forum: Login and say Hello
Topic: Hi from Cardiff
Replies: 8
Views: 8673

Re: Hi from Cardiff

You certainly are not kidding! I measured the floor plan correctly, but didn't consider how HIGH it is and didn't know that you need at least another 200mm at the back to allow for the door over the tube to be swung open. Going to have to re-think my workshop layout again, it seems. Wish the tube do...
by Meta-Concepts
Thu Sep 15, 2011 10:56 pm
Forum: Login and say Hello
Topic: Hi from Cardiff
Replies: 8
Views: 8673

Hi from Cardiff

My 1290 has arrived and I am looking forward to making things!

Terry