Re: Drill press
2012-01-27 by tda7000
I use a Proxxon FBS rotary tool in a Proxxon 140/S stand Lhttp://www.proxxon.com/eng/html/28606.php) It runs faster than the TBM drill press (5,000-20,000 RPM)
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Re: Drill press
2012-01-27 by Robert
Here s another link to the Proxxon TBM115, this one has data sheet, instructions, parts diagram pdf downloads, the price is $239 though, I would buy from the
Re: [Homebrew_PCBs] Re: Drill press
2012-01-27 by Steve
Thanks for the advice Chris and Robert. MicroMark often has a sale of one sort or another and for this week they are having a 15% off sale. So their 81631
Re: Drill press
2012-01-27 by Robert
I m looking at those exact same two myself, I m leaning towards the Micro-Mark but they are both nearly identical. The Proxxon comes with a set of collets and
Re: Drill press
2012-01-27 by Chris Kleeschulte
I have the MicroMark 81631 and I love it. I NEVER break bits even down to the very smallest holes. The rotation speed could be a tad faster, but it gets the
Drill press
2012-01-27 by Steve
Anyone have experience or thoughts about either the Proxxon 38128 or MicroMark 81631drill presses? I m looking at one of them for use in (among other things)
Re: [Homebrew_PCBs] UV light sources
2012-01-26 by DJ Delorie
... For UV etch resist films, something around 390 nm is normal, but each film has its own specs. Think&Tinker film, for example specs 350-420 nm . I
Re: [Homebrew_PCBs] Re: UV light sources
2012-01-26 by Leon Heller
... Just use a test strip as used to be done with photographic enlargers. Leon -- Leon Heller G1HSM
Re: UV light sources
2012-01-26 by David
Sorry, forgot one other measurement [for LEDs]: Luminous intensity: Brightness of the LED at a given current: mcd = millicandela Visible Blue sits at around
Re: UV light sources
2012-01-26 by David
Hello, UV light wavelength is measured in nanometers, Nm, i.e. one billionth of one meter, the amplitude [intensity] is measured in milliwatts per square
RE: [Homebrew_PCBs] UV light sources
2012-01-26 by Boman33
Per, OceanOptics is the low-cost supplier. I can get you other companies if you want to spend more money.. For spectral output you typically would measure
Re: [Homebrew_PCBs] UV light sources
2012-01-26 by Rich Osman
This is true for a point source, but most sheet exposures are defined in watts per square centimeter or something similar. I interpreted Per s question to be
Re: [Homebrew_PCBs] UV light sources
2012-01-26 by Malcolm Parker-Lisberg
Per UV intensity is measured in Watts per Steradian, see:
Re: UV light sources
2012-01-26 by Rich Osman
Spectrum should be pretty easy with diffraction through a prism. It doesn t seem that you need enormous accuracy or precision. My concern is measuring power
Re: [Homebrew_PCBs] Re: MGR Dry Film Photoresist Sold by SRA Solder
2012-01-25 by Roland Harriston
David: Thanks for the good information. Roland F. Harriston, P.D. *******************
Re: MGR Dry Film Photoresist Sold by SRA Solder
2012-01-25 by David
Roland, My mistake on my last message, I use the Sodium Metasilicate based developer for Positive Photoresist not negative photoresist!!, the product from the
MoRe: MGR Dry Film Photoresist Sold by SRA Solder
2012-01-24 by Roberto
Hello, I use it for a year and sold take that works well in rolls of 2 meters are able to make the RF PCB with high resolution take it good Roberto
MoRe: MGR Dry Film Photoresist Sold by SRA Solder
2012-01-24 by David
Sorry for delay in replying, had to go out for a while, but i see your question was answered perfectly well, i also use Chiltern Connections Ltd [UK company]
Re: [Homebrew_PCBs] Re: MGR Dry Film Photoresist Sold by SRA Solder
2012-01-24 by Roberto
Hello, I use it for a year and sold take that works well in rolls of 2 meters are able to make the RF PCB with high resolution take it good Roberto ... From:
Re: MGR Dry Film Photoresist Sold by SRA Solder
2012-01-24 by bebx2000
The change of color when exposed is a real plus. I find that determining correct exposure time is a real pain when working with Riston or similar products.
MoRe: MGR Dry Film Photoresist Sold by SRA Solder
2012-01-24 by Rich Osman
SRA sells a 1 x 5 roll of MG 416DFR Negative Dry Film Photo Resist for $15.95 http://sra-solder.com/product.php?xProd=6652 and MG 4170-500ML Negative
Re: Photo Resist Gelatin Bicromate Process
2012-01-24 by bebx2000
Jeff, I am pretty sure that patent (4447519) is talking about a weight/volume solution. Ammonium dichromate solubility is 36.4g/100g water(1 g water = 1 ml
Re: [Homebrew_PCBs] Re: MGR Dry Film Photoresist Sold by SRA Solder
2012-01-24 by Roland Harriston
David: Does this Ebay seller also sell the developer for this film? What is the developer for this type of film? Thanks for the info. Roland F. Harriston,
Re: MGR Dry Film Photoresist Sold by SRA Solder
2012-01-24 by David
Hi, I m not familiar with SRA, but, I have used dry film photoresist and had excellent results, [no mess!!] I ve purchased in the past from this seller on
MGR Dry Film Photoresist Sold by SRA Solder
2012-01-24 by Rich Osman
I m sure it s a repack of another vendors product. Any one have any pro or con comments. I ve had good luck with SRA as a vendor. -- mailto:lists@n1oz.net
Re: Photo Resist Gelatin Bicromate Process
2012-01-24 by Jeff
Hi Baxter, I bought some ammonium dichromate and will try the patent you suggested of 1% solution ammonium dichromate sensitizer. My question is, do you know
Re: [Homebrew_PCBs] Re: UV Light Box Bulbs
2012-01-23 by Harvey White
... Clear mercury vapor may emit short wave UV light, and if so, can seriously damage your sight. The germicidal UV lamps are very dangerous to watch, and
Re: [Homebrew_PCBs] Re: UV Light Box Bulbs
2012-01-23 by Russell Shaw
... Hi, I d guess the clear mercury vapor bulb would deliberately have the UV filtered out, but i m only guessing. I d think the easiest and cheapest way to
Re: [Homebrew_PCBs] Re: UV Light Box Bulbs
2012-01-23 by DJ Delorie
... Just for yuks I priced out a new and improved UV exposure box like my old one, depending on how picky you are about eBay sellers... $40 for bulk UV leds
Re: [Homebrew_PCBs] Re: UV Light Box Bulbs
2012-01-23 by DJ Delorie
If you use LEDs, you still need a current-regulated power supply, and the more LEDs you use, the bigger the power supply (watts) needs to be. Here s mine:
UV light sources
2012-01-23 by Per Mattsson
Hi guys! How can one measure the wavelengths, either a graph over the spectrum or certain wavelengths of a UV-source? What unit would one use - Watt, Joule? I
Re: [Homebrew_PCBs] Re: UV Light Box Bulbs
2012-01-22 by Malcolm Parker-Lisberg
You also need a source of the matching series ballast choke. Malcolm I don t suffer from insanity I enjoy it! ________________________________ From:
Re: [Homebrew_PCBs] Re: UV Light Box Bulbs
2012-01-22 by Rajendra Jain
Source for HID mercury lamps. http://www.1000bulbs.com/category/mercury-vapor-lamps/ ... -- Imagine no possessions I wonder if you can No need for greed or
Re: [Homebrew_PCBs] Laminator
2012-01-22 by michael tenore
I bought a GBC H535 on eBay and I get excellent results! It will pass 1/16 inch easliy! regards Mike ________________________________ From: Chris
Laminator
2012-01-22 by Chris
I ve seen various postings about the pros and cons of using a laminator versus a clothes iron, and I m inclined to use a laminator. Is there any particular
Re: UV Light Box Bulbs
2012-01-22 by matrice197
I am going to be building my first enclosure for UV photo-resist PCB manufacture and I like to source as many of my components locally when possible. Looking
Re: UV Light Box Bulbs
2012-01-21 by matrice197
I am going to be building my first UV exposure box here soon. As a rule I like to source as much as I can locally. For a UV source, I looked to Lowes. I found
Re: UV Light Box Bulbs
2012-01-21 by matrice197
I am going to be building my first UV exposure box here soon. As a rule I like to source as much as I can locally. For a UV source, I looked to Lowes. I found
Re: UV Light Box Bulbs
2012-01-21 by designer_craig
One souce of inexpensive UV bulbs is the little U shaped bulbs used in the gel nail curing units -- You can even buy the entire unit and hack out the ballast
Re: [Homebrew_PCBs] Re: UV Light Box Bulbs
2012-01-21 by Russell Shaw
... I derived the parabola formula then cut out a parabolic arc in two supporting sheets of wood then bent some shiny 1mm aluminium sheet into it. I just
Re: [Homebrew_PCBs] Re: UV Light Box Bulbs
2012-01-21 by Russell Shaw
... I ll have to have a look inside. They were ~400nm IIRC. Friend said at the time the cheap ebay ones were not good and got some from a wholesaler (2-3 years
Re: [Homebrew_PCBs] Re: UV Light Box Bulbs
2012-01-21 by Russell Shaw
... I derived the parabola formula then cut out a parabolic arc in two supporting sheets of wood then bent some shiny 1mm aluminium sheet into it. I just
Re: UV Light Box Bulbs
2012-01-21 by bebx2000
Hi Jeff, I use a metal halide HQI 11 aquarium fixture with a double ended, 150W, 10,000K bulb. The parabolic holder has a special high UV reflector. I got it
RE: [Homebrew_PCBs] Re: UV Light Box Bulbs
2012-01-20 by Jeff Heiss
Sorry Russell, I read too fast. I see you made the reflector from aluminum sheet (aluminum foil?). Jeff _____ From: Homebrew_PCBs@yahoogroups.com
RE: [Homebrew_PCBs] Re: UV Light Box Bulbs
2012-01-20 by Jeff Heiss
Russell, where did you find the cylinder reflector? Did you buy it, scrounge it from something you took apart? Jeff _____ From: Homebrew_PCBs@yahoogroups.com
RE: [Homebrew_PCBs] Re: UV Light Box Bulbs
2012-01-20 by MIKE DURKIN
How manny in the array? Power output and 405nm? To: Homebrew_PCBs@yahoogroups.com From: rjshaw@netspace.net.au Date: Sat, 21 Jan 2012 00:50:27 +1100 Subject:
Re: [Homebrew_PCBs] Re: Silver Ink
2012-01-20 by Mark Lerman
It would waste a lot less ink if you printed with a plotter rather than an inkjet. That way you could easily make several passes and 2 sided boards. Does
Re: UV Light Box Bulbs
2012-01-20 by alex4459jopiklal44
... like a previous post.. we used a sun bulb many years ago...you can obtain it from some second hand store included socket.. we also had a distance about ½
Re: [Homebrew_PCBs] Re: UV Light Box Bulbs
2012-01-20 by Russell Shaw
... Hi, That would mean dismantling the wooden box which is something to attempt while i m at work (where i use it). The reflector and box are sized so that
Re: UV Light Box Bulbs
2012-01-20 by psykhon@yahoo.com
Hi russel: can you post some specifications and pictures of that reflector? Also, what was the largest board exposed on that reflector/lamp setup? Thanks in