View Full Version : Focal Lens distance - tool for setting distance

Corina Hibberd
04-28-2014, 7:34 AM
Hi all

Can anyone tell me what focus lens distance needs to be when engraving using an X1390 100watt Redsail Laser Engraver. The machine came with a small plastic tool used to adjust the distance between the bottom of laser head and material but unfortunately it's been misplaced. I need to know the size so I can make a new one. We're engraving trafolyte material (plastic).

Many thanks,

John Bion
04-28-2014, 8:19 AM
Hi Corina,

If you place a piece of wood/acrylic/anodised Aluminium (anodised alu is possibly best) at a slightly ramped angle, i.e. a bit of wood underneath one end to give a gentle angle, then run a straight vector line with you laser across it from lower to higher side you will be able to see at which point the laser has focussed best (thinnest line) and measure the distance from that point to a suitable place on your lens carriage. You can then cut a new focus stick to this length. Hope that makes sense?
Kind Regards, John

Corina Hibberd
04-30-2014, 5:03 PM
Thanks John. I'll try that. Regards, Corina

Deane Donaghy
05-01-2014, 12:00 PM
My Redsail X700 50W laser is set to 14mm. from the laser to the workpiece so it might be the same.
I would just email them and ask, they good to deal with generally.