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91
The Design Shop / Re: DRO for Warco Major mill
« Last post by SeaCat on January 09, 2019, 06:23:55 PM »
The term "snagging" in the UK usually refers to correcting the defects in a project.  As a project progresses defects arise which need to be 'corrected'.  These are put on a "Snagging List".  Before the project can be said to be completed all the '"snaggs" on the list need to be corrected to the project managers satisfaction.  Amongst other things.

That's the theory anyway!   The practice may be different!

Chris
92
Wood & Stuff / Re: carousel
« Last post by shipto on January 09, 2019, 05:43:24 PM »
So the skirt? (I suppose thats as good a name for it as anything else) is fitted and primered all ready for painting. I am making this a priority now so much so that I got a new spindle for my CNC last week and apart from a quick look I havent taken it out of the box.
93
The Design Shop / Re: DRO for Warco Major mill
« Last post by BillTodd on January 09, 2019, 04:55:53 PM »
Mount the scale to the front. then...

make a couple of stops that attach to the Table dovetail  and to the small area below the scale .  If you are using stops , then you are unlikely to be using the full range of the table , so the loss fo a few centimetres of 'stop' range wil not cause you a big problem ( nothing that could not be fixed 'on the day')

Make an electrical stop that bleeps with incresing rapidity as you approach the stop point.


94
The Design Shop / Re: DRO for Warco Major mill
« Last post by PekkaNF on January 09, 2019, 04:37:31 PM »
I am now considering seriously fitting the scale front/low in lieu to X-axis stops. Where is this world getting at?

Pekka
95
Metal Stuff / Re: Tig tungsten
« Last post by vintageandclassicrepairs on January 09, 2019, 02:40:33 PM »
96
New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by tom osselton on January 09, 2019, 02:33:18 PM »
Nice to see you can add to it, my mill just has a manual valve on the front of it I have to turn.




I havenít had a swollen head since that frying pan incident!  :wack:
97
New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by PekkaNF on January 09, 2019, 01:16:58 PM »
ommmmmmmMMMMMMM - gggggGLOW!

You can go down to nearest town with zipper open carrying a poster: I KNOW HOW TO PROGRAM S5 AND MAKE CHILDREN! :D

Pekka
98
New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on January 09, 2019, 10:32:25 AM »
I admit to a nice inner glow and a not inconsiderably swollen head after today's achievements  :ddb: :ddb:

Wanting to add a 'Wash Down' facility - ie a simple hose gun off the coolant pump to manually wash chips away and clean up a work piece, I decided that I needed a pair of valves acting in anti-phase. One in line from the coolant pump to the Tool Turret, and a second one from the coolant pump to the gun of the wash down facility.

Dead easy with relays and buttons, but I thought, why the heck should I be adding MORE buttons when the 820T is crawling with ones that have never been implemented, and there's a perfectly good PLC program running that I aught to be able to modify.

Having identified the input addresses of the front panel buttons that I wanted to use (I96.3 and I96.4) and found two spare 24 volt digital outputs (Q2.6 and Q2.7), with a bit of trepidation I started poking about in the PLC program live on the machine.

Now despite months of work learning about the PLC, it's 'STEP5' programming language, managing to down load and produce a paper copy of the PLC 'ladder logic', I have only before passively read what is in it and never attempted to edit, alter or add it it. So this is a first.

STEP5 is a very frustrating program to use to program, however today I've managed to add another 'Rung' to the ladder  (Segment 173 to be pedantic!) and amazingly it works  :ddb: :ddb:

Trivial in the extreme as far as the logic is concerned. One button sets an S/R flip flop, the other button resets it, and it's output controls one of the valves. Now I need to add subtleties to it, interlocking so it will only work when the door is open, will not work when the chuck is spinning or a program is running, and ensuring that when one valve opens the other closes, but that's finessing that can be done at my leisure, the point is I've proved that it's possible and I've managed to do it - hence the warm glow.

. . . back to reality - I need to go muck out and feed the pigs  !

99
The Design Shop / Re: DRO for Warco Major mill
« Last post by PekkaNF on January 09, 2019, 07:15:59 AM »
Thank you Andrew, I know that system and lay-out. I rather use cheap standard parts to this one.

I will deal with the warping when it shows.

Rather than accept losing travel wouldn't it be better to mount the x axis DRO on the front of the table and do something else so you could continue to use stops.  On my mill I added a steel rod below the x axis scale which I can clamp stops to.  Although to be honest I haven't made the stops yet.

Russell

I was considering it, but it would bring the read head forward and fairly middle - to my work area.

Easiest way to mount the tape on the front of the table would be to remove the measurement tape rule out of groove and replace it with the magnetic tape. Perfect fit. Then it would be possible to use mounting holes of the stationary top block and indicator and replace it with a foot that would double as stop block and read head mount.

But then the tape would be really front of the table, where I tend to use squares, tools, magnetic stand etc. And the read head would be pretty proud and non shielded location.

Second option would be to mount the tape below the current stop into more protected position. That would mean some machining for the magnetic tape (2x10mm grove for magnetic tape + 0,5x16 mm for 0,2 mm stainless steel protective strip. This machining would be into readily machined surface .... maybe minimal chance for warping?

OR bolt on rail for magnetic tape and wonky looking arm. for stopper to clear this.

Another hour or two lego play time on the milling machine :lol: Maybe all would just fit there and convincingly stay out of troubles way.

Pekka
100
Tools / Re: Cross slide nut for EDGWICK lathe
« Last post by HalifaxHerbert on January 09, 2019, 07:04:17 AM »
Thank you to every member who contributed, much appreciated.
I decided to keep the old girl after 2 close scams on fleabay, when I tried to sell her "as is with wear etc".
The Denham lathe is still missing its cast iron cabinet and end leg, another story (thread) and job for the future.
Ade, how is the "MAZAK" ?

A happy and prosperous new year to you all.
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