Search found 128 matches

by johnrpm
Mon Aug 11, 2014 4:50 pm
Forum: Display Devices
Topic: Lens replacement
Replies: 8
Views: 8018

Re: Lens replacement

sorry for the late reply, been installing solydx linux on my systems, my head has been elsewhere, I have a few boxes of lenses I have collected over time, and kept trying them all untill I got the result I was looking for, not very helpfull for you I am afraid, I have seen lens calculator online whi...
by johnrpm
Thu May 29, 2014 3:25 pm
Forum: General
Topic: Painting printed parts.
Replies: 9
Views: 11786

Re: Painting printed parts.

Clear acrylic is good to seal parts and stop darkening with time, its pledge kleer by the way, but for elecroplating a coat of silver loaded paint is used as a base layer, not cheap, then nickel or copper plated, DIY plating is very do-able but like most things has a technique needing practice. Its ...
by johnrpm
Wed May 21, 2014 4:21 pm
Forum: Software Forum
Topic: Laser SLA reprap
Replies: 23
Views: 21286

Re: Laser SLA reprap

May well be talking rubbish here, but can the firmware be configured for dc extruder, if so a relay would work, else, could the frequency of the stepper pulses be used to control laser power, F to V,
or a frequency switch, (comparator)
by johnrpm
Wed May 21, 2014 4:09 pm
Forum: General
Topic: Painting printed parts.
Replies: 9
Views: 11786

Re: Painting printed parts.

I dip or sparay sla parts with johnsons kleer floor wax, its been known by other names over time, and is not wax but clear acrylic. it seals against uv from sun, and can be a base for further paints. my wife uses gliss hair product, don't know what it does, but empty pump pray bottles are ideal, wit...
by johnrpm
Mon May 05, 2014 6:14 am
Forum: Z-Axis and Tillt/Slide axis
Topic: Belt drive Z-axis
Replies: 7
Views: 9810

Re: Belt drive Z-axis

Just an observation..... if the weight is always downwards, then with a leadscrew backlash
is not so much of an issue, provided that friction is not too high, but maybe I have missunderstood.
by johnrpm
Mon May 05, 2014 6:08 am
Forum: Display Devices
Topic: Transparent LASER Mask
Replies: 1
Views: 3368

Re: Transparent LASER Mask

Thanks for posting this, very interesting stuff, I have been told that in sensative toothpaste, nano particle glass is the ingrediant that fills the tooth (holes), so it is made in bulk, just need to get some.
by johnrpm
Tue Apr 15, 2014 1:54 pm
Forum: Resins
Topic: metal dlp printing
Replies: 3
Views: 4628

metal dlp printing

This look interesting, http://www.3ders.org/articles/20140415- ... etals.html
apart from the hassle of fireing the parts, the thought of making metal and ceramics really appaeals,
I think bluestone had some sort of nano ceramic filler.
by johnrpm
Sun Mar 30, 2014 4:42 pm
Forum: Resins
Topic: Resins For Investment Casting
Replies: 57
Views: 48585

Re: Resins For Investment Casting

SLA systems use a build style called quickcast, its honeycombed, I mentioned somewhere in another post that it may be possible to
do the same with a form of dithering or image processing?.

The casting firm need experiance with it, as its different to wax.
by johnrpm
Sun Mar 30, 2014 4:34 pm
Forum: Electronics
Topic: The Missing Link Of GRBL Controller, Firmware
Replies: 5
Views: 6540

Re: The Missing Link Of GRBL Controller, Firmware

If you are on windoze, make sure you have the right usb port set, I used grbl controller to get things running well first.
by johnrpm
Fri Mar 28, 2014 7:53 pm
Forum: Hardware
Topic: DIY DLP resin printer with sliding y-axis for release
Replies: 3
Views: 5092

Re: DIY DLP resin printer with sliding y-axis for release

I want to try ultrasonics or vibration to help release, maybe combined with a rotation action, but will not get time for a while.