| Products > Test Equipment |
| Hewlett Packard 740B DC Standard Digital Voltmeter (and 740A) |
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| BradC:
--- Quote from: beanflying on February 15, 2018, 11:24:51 pm --- Last time I did any of this was nearly 30 years ago on aluminium irrigation couplings with oxy/acetylene. More heat would be a help here not more temperature. --- End quote --- I've had a little oxy/propane rig for years using incredibly expensive disposable oxygen bottles that last not much longer than a fart at $45 each. I used it when I really needed it, but have an array of air/fuel torches that got loads of use. Now Bunnings do no-rental swapsies of decent sized oxygen bottles (by comparison to the 100L disposables) I don't even get the gas/air torch out anymore. More heat, easier to control and the potential for the same heat in a much smaller area. I've also done some soldering with the TIG. The argon shield helps keep the oxides under control and because aluminium conducts heat so well you don't have to get the solder near the arc. Sometimes silver solder copper with it too. Nice job by the way! |
| beanflying:
I have been looking seriously at a small Tig/Inverter again after avoiding buying one for years. I would put my combined welders bills at $1k'ish in the last 10 years so generally paying someone else has been the better option. Like all things keeping the practice up with welding is one of the keys. When I got turned down on this one by a 'professional' business and used my $15 evilbay torch and disposable Butane cans to get a result makes you go Mmmmm about current training and the narrow range of skills of some current tradies. I was taught by a 50+ year old at my first real job because taking the then 3 phase Tig out to the paddocks wasn't really practical and it was what was taught at Tech Schools before TIG's ;) OMG Starting to sound like an old man 'when I was a boy' ...... :-DD |
| tautech:
I've found LPG torches that you can use on your BBQ bottle quite effective heat sources and cheap to run. The 'old school' vinyl layers used to use quite large units with 'soft' flames for softening the vinyl when cove'ing under cabinetware toe kicks. I've got one of each but the smaller one sees a lot more use. Better with a 4kg cylinder than having to hump around a 9kg one. Something like this one: https://www.trademe.co.nz/Browse/Listing.aspx?id=1544249384&mkwid=sEIcRBR8m_dc&pcrid=225543738224&pkw=&pmt=&plid=&gclid=Cj0KCQiA_JTUBRD4ARIsAL7_VeXBL3kc2SVVvj_tDa6tHL9VmdrwC2upoOEt5lb5ayv_cAyU0L8RPrgaAqmMEALw_wcB |
| Cubdriver:
You did a beautiful job fixing that broken casting! Bravo! :-+ :-+ The mercury standard cell in the 740B should be on the right front corner of the A10 board. Here's a screen cap (sorry for the poor quality) from the quickie video I did (and never uploaded until just now) of mine when I first got it a few years ago. The battery is visible briefly around the three minute mark in the video, in all its corroded glory: -Pat |
| beanflying:
You mean like this crusty little bugga. 0.5mV aint doing much I suspect ::) |
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