Another 4" CNC rotary table

Gallery, Projects and General > Project Logs

<< < (5/19) > >>

madjackghengis:
j4son, hi, I am glad you decided to do your build log on the electronics, I am about to embark on a parallel build for my own rotary table, and have just joined the CNC website Kwackers posted his build on, to get the information, thanks Kwackers, for putting this out in public, I never would have seen it without Chris' build, and would never attempt it without your having tried it first, and "cut a path", you don't know how much your work is appreciated. I have to say a couple things: first, pc board making has changed much since the last time I did it, I had to burn onto a clear sheet, spray on etch resist coat on the blank board, and put the board and circuit on clear in a glass topped box out in the sun for a few minutes, before sticking it in ferric chloride and etching. Having made hundreds of boards at a time this way, in a factory for the initial run, use carbide drills only, and when they feel dull, they are, don't use them any more, at risk of having to do some mining, and digging. I haven't decided how to do my board yet, I don't have all the equipment you do, but you have shown the board is a workable issue, even if it has been since 81 since I last made a board. That's a great start, I'm glad you're using so many used parts, as I may be able to copy, and what was said about huge capacitors is dead on right, it works. I'm wondering if I threw away a useable keypad when I disassembled the last microwave oven I threw away. Make lots of pictures so us slow folks can keep up please. :poke: mad jack

Spurry:
This looks like an EGHSHO project! Every Good Home Should Have One. Does anyone one know if a DXF drawing of the hole positions is available from anywhere? It would be very tedious to drill all those tiny holes manually.

Thanks :wave:

Pete

j45on:
Time to drill some holes :dremel:

First off I got board trying to drill the holes with a pinvise and a 0.8mm drill (smallest I have)
so I got out the dremel workstation and proceeded to FUBAR the board :scratch:
Tying to line up the tiny holes in the copper is no fun especially when you pull the handle and the drill decides to go another way

sorry for the poor pics
So I etched another board and had a look at the drill press
I raised it up on some scrap wood

And hot glued a old webcam under the table :loco: stick with me

view from webcam

I taped a bit of scrap pcb down and drilled a hole

Then I stuck a piece of OHP film to my monitor (cling film would probably work to)
and marked the hole with a sharpie

Then drilled a few more test holes and was happy enough to have a go at the new board
it's not perfect but should do if I was to do this again I would be less impatient and purchase some smaller drill bits

I think with a better aligned and focused web cam and a better press or use my mill :doh:
That this would be a very accurate way to drill pcb holes

Please bear in mind that I used 0.8mm thick pcb I don't know how well light would shine through thicker pcb

kwackers:
Have you missed one? Certainly looks like it..

Far right hand one on the keyboard connector.

Drilling holes in PCB's is something you develop a knack for. I have small drill just for that purpose. The work area needs to be well lit and I tend to quickly bring the drill down to the PCB to check position then a quick jab and it's through and on to the next one. Once you get used to the amount of 'parallax' error etc then it takes about half a second a hole.

I like the webcam idea though!

j45on:
Looks like I will be etching another :(

My grip slipped while I was shearing the board to size :bang: Third time lucky I suppose.

Kwackers
Looks like I did :doh: I have loads of PN222A transistors would they be any good for this ?

Navigation

 Message Index

Go to full version