Todays update from Bodgers Lodge

[John Stevenson 1Participant @johnstevenson1]

Posted by Ian Phillips on 26/01/2017 19:13:22:

Was my idea of creating the hydrodynamic profile by cutting the vane out of thicker material not a go'er?

Ian P

.

Hang about Ian, I was coming to you.

In this instance, then no, as two pumps are needed and have been sourced but with cast impellers. The bits needed have already been sourced and cut. So these two are a done deal.

Can I use the idea in the future? Possibly but as my laser cutters are limited to 20mm and I have no water jet cutters who I deal with then I'll be the new boy on the block, wanted a very small order so I'll be back of the queue and probably get ripped off to boot.

That's usually how it works.

I'm not convinced that the hydrodynamic shape is needed for this application, which it turns out is to drain a waste chemical into disposal vats.

i have seen these types of pumps with straight vanes and parallel vanes. You only have to look inside a subs pump on a lathe to see how crude they are.

I could have milled it from the solid but this job like most repair jobs is only worth a certain price, go over this and you get no more jobs of that type. Keep withing what they deem acceptable and they keep coming back.

Anyway job is now nearly done. Impellers are finished but they messed the order up and only cut one wear plate, so I'm collecting the second plate together with 50 stepper motor brackets tomorrow afternoon on the way up for my weekend cuddle with the Delectable Debs.

For the person who asked there isn't a step in the thick wear plate but as it's 16mm thick they set the focus at mid point so the cut is made up of two diverging angles, albeit very slight but it gives the step impression.

Doesn't matter in this case as they have been cut a couple of mm oversize to skim up in the lathe.

[John Stevenson 1Participant @johnstevenson1]

Posted by JasonB on 26/01/2017 07:21:22:

Ian, read again vanes are 8mm material then bent. There is one laying on teh unassembled plate.

JohnS, be interesting to see how your 3in1 welder copes with this job

.

Negative thoughts Moriarty.

Have a little faith Baby

This is the 40mm boss welded into the 8mm stainless plate with the cheap Chinese TiG.

Could be better at the bottom as regards presentation but not that worried as it needs facing off.

I have recently had two new lenses fitted to my eyes and not settled down enough to get my new glasses so I do have a problem at time focusing up close but once I get the new glasses this should cure things.

Outer vane TiG welded. DC @ 110 amps 3.2mm tungsten.

That was enough to pump enough heat into it to get the whole vane glowing dull red.

People take the pi$$ out of these Chinese welders but if you buy a decent one and not a budget one they are awesome compared to what we had to weld with 10 years ago.

I have now sold my BOC TradesTiG as compare to this it was a dinosaur.

Never touched this at all, just works out the box [ including all the gas fittings ]

Longest weld I have done with this was in 5mm thick alloy on a pickup tailgate where a digger bucket had swiped it. 40 minutes continual welding, No idea what the duty cycle is on this machine.

[HillclimberParticipant @hillclimber]

Have to ask, what is the mystery brand of your Chinese TIG. Obviously AC/DC?

Cheers, Colin

[John Stevenson 1Participant @johnstevenson1]

Colin,

Had it about 5 years now so the exact model I have probably isn't made any more but this is the closest I can find.

**LINK**

As regards looks and features. The current model is different in that it's all in a sloping case. I paid about £420 direct from China when I was over there, they should have cost about £600 at the time but the newer design is around £750 now.

The 200 amp AC/DC from someone like R-Tech is just over a grand but you are paying for UK support.

[Mark CParticipant @markc]

"just works out the box" But remember to swap the earth polarity over if you have been using it in MIG mode…. otherwise the electrodes (and much everything else on the end) vaporises in short order, oh, and I do mean "vaporise"

Mark

I have an R-tech machine and they are good, R-Tech that is.

Edited By Mark C on 26/01/2017 20:33:44

[John Stevenson 1Participant @johnstevenson1]

No MiG Mark.

It's just an AC/DC welder with stick [ MMA ] thrown in.

I rely on two large industrial 3 phase MiG welders. A BOC TransMiG rated at 325 amps running steel and an ESAB 250 amp machine running stainless, both on 1.2mm wire.

I still have a single phase Camarc 200 A on 1.0mm wire but have given this to my grandson as it can run 0.8 wire as he's restoring an old American Ford F250

[Gray62Participant @gray62]

Apologies for hijacking to talk about welders.

I have a similar TIG welder bought from Stahlwerk in Germany, whilst we're still in the EU it means you don't run the risk of paying any import duties

So far it has performed admirably on a number of jobs on aluminium, stainless and regular mild steel repairs. Only thing I changed was to get some good quality gas lenses and cups. They made a significant improvement to my welds. Mine also has MMA and plasma capability. I've not used the MMA in anger yet but a quick test when I bought it on some 8mm cor10 showed a significant improvement over the basic buzz box stick welder I previously owned.

Not had cause to use the plasma cutter yet but i've got a job to do this weekend so will see how that goes.

I also have an R-Tech mig set which is also a superb piece of kit and the support from R-Tech is very good.

[Neil WyattModerator @neilwyatt]

Posted by JasonB on 26/01/2017 10:12:00:

But if the holes were made to suit the across corners size of the square you would be able to fit the square peg in the round hole

But that wouldn't be funny

N.

[Mark CParticipant @markc]

John, mine is DC only and is multi mode (Mig/Stick/TIG) and the last time I used it in TIG mode I forgot to swap the polarity on the earth – resulted in a large flash and a nice tungsten/copper flash coating over the job with some vitrified material that was once a gas shield!

Mark

Edited By Mark C on 26/01/2017 23:37:24

[Mark RandParticipant @markrand96270]

Apologies for more thread drift, but it might be relevant to Sir John, Graeme and others. I've also got one of the same welders, albeit with a different (Local Tool Sales) badge.

Be careful if you happen to do a bit of DCEP welding with some 6010 rod or similar. On mine, the return/positive connection is/was grounded to the case. If your welding bench happens to be earthed, as it should be, an escape of magic smoke can occur when one turns the welder on and the welder tries reconcile a positive earthed case with a negative earthed bench.

Repair under guarantee took a few weeks with mine, but was not particularly stressful. Didn't damage the output inverter but the control board got fried in collateral damage.

[Simon Williams 3Participant @simonwilliams3]

Posted by Mark Rand on 29/01/2017 20:06:41:

Be careful if you happen to do a bit of DCEP welding with some 6010 rod or similar. On mine, the return/positive connection is/was grounded to the case. If your welding bench happens to be earthed, as it should be, an escape of magic smoke can occur when one turns the welder on and the welder tries reconcile a positive earthed case with a negative earthed bench.

I was working in a factory in Redditch some while ago, watching a bloke welding on a bit of RSJ held in the vice of the donkey saw. As I watched, sparks started coming from the conduit connecting the donkey saw to its supply. A bit of thought identified that the earth clamp from the welder ground to the RSJ was iffy, and the welding current was passing back to earth via the donkey saw. The same would apply if you earthed the work bench – the earth path has to be able to carry the fault current and return it to the source – in this case the welder..

After a bit of to-ing and fro-ing, we decided that the least worst option was to disconnect the link inside the welder between the ground connection and the supply earth, and thus the welding output was floating with respect to the building earth.. That way if the welder ground connection was high resistance you wouldn't be able to strike the arc. Of course that means that you could have a workbench at the "live" potential (say 80 volts) but at least you haven't set fire to the building.

Is there a smiley for a hand grenade with the pin out?

Simon

[John Stevenson 1Participant @johnstevenson1]

Just boring work again but got some track rollers to re-machine. They are brand new spare rollers but need boring out larger and deeper to accept larger taper roller bearings as they have identified that the original bearings are not up to the job. Bit of a brute 7" long, 7" diameter and not a lot to hold on whilst I bore the bearing housing out bigger and deeper.

And from the side.

That's an 8" chuck. The pucker factor will be up to a high 8 or even 9 running this at 1200 rpm.

SO..

Break the El Stevo greedy jaws out.

That's got the bugger..
Bored out in-situ so no run out and that's not going to go flying anywhere.

I love soft jaws and can't recommend them enough. Given a set of hard jaws is the cost of a new chuck, every time you use soft jaws and skim them you basically have a new chuck.

OK they gradually wear away but noting to stop you welding new pads on and start again.

My normal set which is in use all the while must be 15 years old and been welded up at least 8 or 10 times.

[warwick wilton 1Participant @warwickwilton1]

Hi john

could the laser cutters do square holes in the plate when they cut them, need the wright angle for the bend in the plate. then just need welding.

Warwick.

[Brian WoodParticipant @brianwood45127]

Hello John,

​Your greedy soft jaws are a particularly fine example of lateral thinking, one of your best yet, thank you for sharing the idea with the rest of us.

I'm sure they are a first class solution to a lot of work holding problems that would otherwise be rather scary.

Regards
​Brian

[Neil WyattModerator @neilwyatt]

Saw these lumps today, the rollers getting bored out must weigh the best part of 30lbs!

Neil

[larry phelan 1Participant @larryphelan1]

Remember coming across something like this years ago,where they were building up the shaft of a turbine and then bringing it back to size. May have been in the old Macano mag ?

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