The Craftmans Shop > New from Old
Tidying Up An Analoy 1401 Alloy Analyser
Pete W.:
--- Quote from: vtsteam on February 01, 2021, 01:14:44 PM ---not boring.... :coffee:
--- End quote ---
Plus one for 'not boring'.
hermetic:
plus another for not boring!!
vintageandclassicrepairs:
Hi Andrew,
Definitely not boring :wave:
John
mattinker:
Carry on boring us!!
awemawson:
You are all too kind - I imagine you all snoring in front of your PC's :lol:
I dug out the second Analoy 1401 - I know that it has worked in the last few years but when I plugged it in, although I could strike an arc I got no indication on the LED bargraph of signal (rather charmingly they refer to these led bars as 'candles')
A bit of poking around showed that some of the decomposing foam had got into the 25 pin D connector for the probe - a quick blow out with compressed air and not only was it now working, but giving identical results to #1 on my ingot of LM2 alloy. This is good news and gives me the confindence to pull it apart and give it the same treatment the analyser #1 got last week.
My purchase of pencil leads to potentially make some graphite points turned up. These are 3.2 mm 5B leads intended for a propelling pencil . Quickly cutting off the end of one to make an electrode and trying it I immediately saw that the arc was burning significantly more fiercely. the electrode itself starts to glow and is much more fragile.
The test results differed greatly from the correct electrodes with the proportion of silicon showing higher at 23 % and iron also higher at 6.1% Now there are are presumably all sorts of binders added to the leads, but another variable is where the electrode sits in the chuck. Due to the engineering of the collet a 3 mm electrode sits more deeply than these leads at 3.2 mm. Now I know electrode height affects things. When I've tried to re-insert a used electrode and held it so that it sits a bit higher (to make up for burn back) and over egged it so too much sticks out some elements disappear from the print out. Presumably the part of the CCD device devoted to those elements isn't receiving light.
. . .all very complex . . .
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