Recent Posts

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91
Metal Stuff / Re: Does anybody care to educate me on centreless grinding?
« Last post by mc on January 06, 2019, 05:44:40 AM »
Thanks for those vids Pekka.
That surface grinding one had popped up on my feed, but I had not watched it until now. It certainly gives me one potential option if I go down this line.

The belt one, I'm going to guess is aimed more at getting a brushed/clean finish rather than good tolerance.

And yes, industrial centreless grinders all seem to be big, but then they're all aimed at big throughput with minimal adjustment. If I was to go for grinding, I'd hope to have something reasonably compact, but I'm well aware the smaller the wheel, the more adjustment it'll need to keep tolerances.
92
Introductions / Re: presentation
« Last post by John Rudd on January 06, 2019, 04:59:59 AM »
Welcome from me too...
Do you have any specifics with the problems you have with your cnc machine?

Maybe start a fresh thread?   :dremel: :zap:
93
Introductions / Re: presentation
« Last post by awemawson on January 06, 2019, 04:28:50 AM »
Welcome aboard Rayfredo, you are not our only member in the vicinity of Paris.

( . . .cue Matthew  :clap: )


94
Introductions / presentation
« Last post by rayfredo on January 06, 2019, 04:11:52 AM »
Hello everyone

I am new to this forum; my name is raymond, and i'm french, i live in paris
I was a professor of production mechanics, and now I'm retired
I make a cnc 4 axes of my design with a controller RMHV2.1 with which I have problems?

can you help me, solve the problems?

sorry for my English, I have to translate everything

thanks in advance
cordially, rayfredo
95
Metal Stuff / Re: Does anybody care to educate me on centreless grinding?
« Last post by PekkaNF on January 05, 2019, 07:03:30 PM »
Maybe you are familiar with this?



Because grindingwhees can be hands full, mabybe belt would a way to go...something like this:


Real machines tend to be powerhungry behemonts, here is the tiny one:


Pekka
96
The Design Shop / Re: DRO for Warco Major mill
« Last post by PekkaNF on January 05, 2019, 03:38:57 PM »
You could do like I did on my cross slide, and bond the magnetic tape directly to the machined back side of the table.  If you put the reader off center, you could get it on there with no loss of travel.

Sent from my SAMSUNG-SM-G891A using Tapatalk

That is a pretty good option. Easy to make and maintain.
97
Project Logs / Re: PCB UV exposure box
« Last post by AdeV on January 05, 2019, 02:55:29 PM »
Sooo, after a few experiments, 3rd time lucky! (pic 1)

After etching... one track has undercut (pic 2). Oddly, the tracks that LOOK broken are fine, and one that looks fine isn't. I tried to fix it with some solder, but no joy.

Decided to drill it anyway (pic 3), silly me forgot to check the drill bit size and the holes are a little too large, but there looks to be enough pad left to solder to. Too late to start now, that's tomorrow's job. I'll bridge the broken track with a tiny bit of wire.

So, if the soldering goes well, then the jury will be back in! The provisional verdict so far is:
  • The LEDs are now doing the job nicely
  • The drilling machine works fine; it's a bit of a chore setting it up without any alignment marks, but I pretty much got there OK
  • Cupric Chloride works just fine as an etchant. A bit slow, perhaps, but maybe I didn't make it strong enough, I'll try a new batch another day.
  • Will it solder....
98
Metal Stuff / Re: Does anybody care to educate me on centreless grinding?
« Last post by mc on January 05, 2019, 02:32:22 PM »
Thanks for the input guys.

The finished parts would vary between around 1 to 3", and some kind of between centre grinding setup would work for the parts with a centre hole, but not all parts would have a central hole, hence why I was looking at centreless grinding.

I spent a bit of time today looking at items that are already available, and it would appear nobody else is grinding their parts, as all the parts I've seen so far are just turned finish, so a roller box is now looking like a more cost effective option, at least for now.
99
Tools / Re: Cross slide nut for EDGWICK lathe
« Last post by Pete. on January 05, 2019, 01:50:39 PM »
You shouldn't suffer chatter from a worn not or screw, chatter comes from worn or burred ways and mating faces. Fitting a new screw and nut often improves chatter merely because the closer fit adds rigidity to the assembly - it masks the problem but doesn't cure it. The down-side of course is that your new screw and nut wear faster.
100
The Design Shop / Re: DRO for Warco Major mill
« Last post by WeldingRod on January 05, 2019, 01:48:15 PM »
You could do like I did on my cross slide, and bond the magnetic tape directly to the machined back side of the table.  If you put the reader off center, you could get it on there with no loss of travel.

Sent from my SAMSUNG-SM-G891A using Tapatalk

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