I stumbled onto your IRONCLAD toner transfer method.
I use the heavy metal method:
On 09/25/2018 12:54 AM, unclefalter via
Groups.Io wrote:
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Thanks Rob.?
Yeah, the issue I have is with the holes along the bottom of
those boards for the bus.? Everywhere else has been mostly
fine.? But the bit sort of goes through them, and then they
wrap themselves around the drill bit and pull off.
?
I’ve got pics
of the board I’ve made and the artwork:
?
The bit I am
using is a Dremel 1/32” (?) bit.. it comes in a pack of 6 of
them, it’s the very smallest one.? Seems pretty sharp to me
but maybe not.? I’ve tried different speed settings with the
dremel to see if that helps but so far no dice.
?
That’s cool re
your CP/M system – I just bought a Ferguson Big Board II
that was setup that way also.? Unfortunately the previous
owner decided to toss the case, keyboard and floppies.?
Fortunately they saved the board.
?
Brad
?
?
Found some
pictures of Jon Titus’ Mark-8.
My first computer was a CP/M 8 user system with two 8 inch
floppies.
If you are drilling those really tight IC pads you might need
sharper drill bits.
On 09/25/2018 12:17 AM, Rob via Groups.Io
wrote:
I use a #60 drill bit and have
found that a dull bit makes a mess or breaks.
I like a larger trace and landing size for my home brewed
circuits.
I always make a dough nut or cross shape in the artwork so
the drill bit
will waltz into the PCB without binding too much with the
copper.
?
I often get dozens of PCBs out of one #60? drill bit
before it breaks.
I used to use smaller drill bits ..#70.. but concluded
that the smaller
hole was not worth breaking 2 bits on each PCB.
?
On 09/24/2018 11:34 PM, unclefalter via
Groups.Io wrote:
Hi guys,
?
So I’m working on a replica of Jon
Titus’ Mark-8.? I’ve made a set of boards using his plans,
and also using some 1973 vintage blank PCB stock to etch
them on.? So far so good, but I’m running into a problem
along the bottom of the board – there are a series of very
small holes/pads that have to be drilled through for the
bus.? I’m using a dremel with a 1/32” bit and I had the
foresight to put holes in each of the pads.? Regardless,
the drill is simply wrapping them around the shaft and
pulling them off the board.? Not sure what I can do here..
any recommendations?? Should I have done the drilling
before I etched?
?
Brad
?
?
?
