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91
Tools / Re: torch for metal melting foundry (audio in portuguese)
« Last post by seadog on January 17, 2018, 05:16:07 AM »
Did anyone notice the state of the table on his pillar drill?  :bugeye:
92
Tools / Re: torch for metal melting foundry (audio in portuguese)
« Last post by celsoari on January 17, 2018, 05:01:03 AM »
That works quite well thanks for showing.

Thanks Tom
93
Our Shop / my backyard home workshop (in Brazil)
« Last post by celsoari on January 17, 2018, 04:59:14 AM »
my shop:


94
CNC / Re: DDCSV1.1 4 Axis controller
« Last post by merc on January 17, 2018, 03:56:15 AM »
:update:
Here's the latest version of Pandora for DDCSV1.1 and RMHV2.1:
http://dl.pandora-cnc.eu/firmware/bleeding/Pandora-20180106.zip

It's not yet tested and therefore I can't claim it is stable. Testing is very welcome.
I have decreased the minimum steps per mm and increased the maximum steps per mm.
Also inch accuracy should be fixed with this version as well. Again, this should be tested.

Best regards,
Benedikt

Hi! I updated to the latest firmware, but still have a problem.
Its in the post https://madmodder.net/index.php/topic,11598.msg147711.html#msg147711
Any ideas how to fix this?
95
Tools / Re: Edgwick Lathe
« Last post by AdeV on January 16, 2018, 08:53:45 PM »
Hey Guys,

I am another EDGWICK 6.5-inch Lathe Mk. 1 owner .

Mine is fitted with a Pratt Burnerd 1210-02505 Precision 250mm chuck with 0.015" run out.

Any ideas ?

Welcome!  :wave: The old Edgwick is a fine lathe, the only thing that's a bit awkward (or, shall we say, less user friendly) compared to some other lathes is the chuck changing procedure....

So, 15 thou of runout, that's pretty serious...

Some questions:

Have you measured the runout on the chuck body? If yes, what do you get?

Presumably the 3 nuts which hold the chuck in place are all tight enough? They don't need to be murder tight, but they do need to be preventing any movement... If they're good, read on...

Put the lathe in it's slowest gear (17rpm), now grab hold of the chuck and try to wobble it up/down and/or back/forth. Any discernable movement (have a dial indicator set up on the chuck body if you can't feel anything). If it's definitely moving about, it may well be wear in the spindle bearings.

If there's no major movement in the spindle bearings, the next step is to remove the chuck. Undo the 3 bolts that hold it to the spindle nose, and withdraw carefully. If it's anything like mine, you have to back them off until they're virtually touching the headstock, then wobble the chuck off, then finish undoing/removing them. Set aside.  Now carefully examine the register in the chuck - any crushed swarf in there? It wouldn't take much of a chip to throw the alignment off.  Check the spindle nose for similar.

If there's no swarf in there, put your dial indicator up against the spindle nose & check for runout again. If you've got runout at the spindle, the bearings need replacing. if it runs true, your chuck is bad. Try wobbling the spindle again; you should see nearly no movement in the DI.

If you can't find any wobble anywhere, put the chuck back on (but not the nuts at this point). Push the chuck all the way home & try to wobble it on the register. If it moves about, then the chuck backplate is either badly worn, or is not the correct backplate for the machine, or has been over-cut when originally machined. This isn't the end of the road for the chuck, if you don't mind messing about re-fitting it: Basically, re-install and tighten somewhat. Run the lathe slowly under power, note the high spot, tap with a rubber mallet/plastic or wooden hammer. Chase the high spots around until you've got it as true as you can, then carefully nip the bolts up, bit by bit, frequently re-checking runout. With care, you should be able to get it pretty damn close; certainly close enough to work with until you can replace the chuck and/or backplate.

Post some pictures!

Good luck!

Cheers,
Ade.
Another Edgwick owner :)
96
How do I?? / Re: One for the Chemists - water softening solution.
« Last post by charadam on January 16, 2018, 07:34:52 PM »
Andrew,

Happy New Year!

Try a search as National Stock No, rather than NATO and you get this:

https://www.nsncenter.com/NSN/6850-12-175-4344

It used to be my life's bane trying to equate across the pond.

97
How do I?? / Re: One for the Chemists - water softening solution.
« Last post by bertie_bassett on January 16, 2018, 04:57:49 PM »
ill see what i can do ;) i had asumed it was a salt based system but will have to get hold of the msds to check
98
How do I?? / Re: One for the Chemists - water softening solution.
« Last post by awemawson on January 16, 2018, 04:50:28 PM »
Ho ho Bertie - send me a sack  :clap:

I found this interesting paper on the Southern Water web site:

99
How do I?? / Re: One for the Chemists - water softening solution.
« Last post by bertie_bassett on January 16, 2018, 04:41:28 PM »
 we have a total loss calgon dosing system at one of our treatment works which might be similar?

the 'calgon' comes in 25kg bags in a granular form and is dissolved in a tank then dosed directly into the drinking water to soften it and help keep the filters clean.

not sure what the chemical composition is but it cant be anything too fancy as its going in the drinking water

100
Tools / Re: torch for metal melting foundry (audio in portuguese)
« Last post by tom osselton on January 16, 2018, 04:40:29 PM »
That works quite well thanks for showing.
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