Member postings for not done it yet

One posibility not yet mentioned is that the lead screw itself might be able to move in and out a little, so need shimming, possibly with a thin washer, to avoid said movement.

Power is calculated from torque and rpm. To avoid halving the power, by running at half speed, the torque needs to double to maintain the same output.

So, in practise, the flux vectored VFD provides more power at slower speeds than would otherwise be provided. It may not give constant power, but sure helps out.

Mike,

Despite what some think, the easiest way is to take pics, both in landscape and portrait, load them to your album and then delete the ones not wanted . So simple. In other words, turn the camera round!

Ian,

Apart from the 3kW diesel genny, which cost me £160 almost 40 years ago (Stamford generators are far better than modern ones, but heavy), I picked up a couple of cheap 2-stroke Chinese c.650W gennys for much less than a tenner apiece - they usually only need a new plug and the carburettor setting properly.

We are picky as to which ones we bid on. The ones later in the auction are usually better value than the earlier ones!

...no resistance...

Just checking, to be certain, here. Do you mean short or open circuit resistance (zero or infinity Ohms). If they are open circuit, check to see if they are connections for the capacitor. One can never tell whether the capacitor has been changed...

Be very wary of trying to start the fridge - unless your inverter is very well protected for overloads! And don’t try it too soon after the compressor has turned off - they can take some minutes before the motor is on minimum load and ready for starting.

All too easy to let the smoke out!

You must either have a much smaller heater (than 500W) or a very large cup, if it takes 20 minutes to boil one cup of water!

It looks like gib removal from the knee will allow the knee and table to be lifted away from the base. Weight, with table, will be considerable and carriers will have the screw to contend with before dropping onto the floor!

Apart from that it looks quite straightforward.

If a 3/4HP electric motor will drive it, then any 3/4HP engine will run it. Power is simply a rate of doing work - it matters not a jot from what the rotary power supply used.

Starting the saw blade with a fuelled engine might present the same problem as starting an equivalent induction motor, but less so if there is the possibility of slipping a clutch or drive belt. But even a slow revving engine with a large flywheel could start it satisfactorily.

Fuel type comes down to cost. My diesel genny currently costs less than twice the cost of grid electricity. But my genny is only mobile, not portable!

SB5 could likely get away with his 2kW generator if the saw blade could be decoupled from the motor, as the surge current at start up would be neither as great nor of the same duration.

One can already see the divergence from the thread starter. The thread is about how the problem was, or will be (hopefully), resolved. With many of the requests for help, there may be multiple solutions (more than one way to skin a cat, as they used to say).

All that was requested here is to see if encouragement for some form of notification of success (or otherwise), at the conclusion to the problem, could be included somehow. The options are generally (but not exclusively) included in the first few replies, after which the tread may continue down one or more of the possible diversionary or explanatory routes.

Thanking responders is an entirely different matter.

It also depends on the type of generator. One cannot really beat a rolled steel magnet framed armature generator for motor starting. Stator wound with rotating field and electronic AVR are the usual order of the present day - both cheap and more likely to need a greater size margin to start any particular load.

I’ve yet to have a problem with my Stamford 4.5kVA genny powered by a Hatz diesel, whether cold or otherwise. It will black smoke at 3.5kW but runs 3kW (resistive) loads all day long.

Several decades ago, my first back-up generator was a 1.5kVA genny, powered by a B&S (supposed) 3HP engine. It would only start the freezer motor if one held the governor wide open. Freezer motor was rated at 160W.

But they are probably brushed A/C or D/C (have a commutator). Not the same as an induction motor. Their speed is dependent on the supply voltage, I believe?

When running, it will take more power than its rating horsepower dependent on the efficiency of the motor - say around 110%.

Starting it, as Mike states, is an entirely different ball game.

If down on power, check the A/C voltage and the frequency of the supply. It may not be even achieving full speed, if the start windings are not being sufficiently energised at start up, so a check on rotational speed would be good, too.

Myford also bought Raglan in the late ‘60s.

Are we comparing apples with apples? Are we comparing airliners with a steam engine, or just the jet engine with a whole locomotive?

It will direct any swarf, which goes through the spindle, away from the gearing.

Why not ask Warco? They are very helpful and would be able to give fairly precise dimensions, I would have thought.

Agree with Hopper, but obviously no Asustralian experience of spanners. The real cheap rubbish are the tools that are not in spec when supplied (thinking here banggood, specifically) - some can be tolerated, while some cannot.

Files and threading are another couple of areas where good is good - and less good is often folly. Although most of my files were purchased at farm sales, I have thrown away an awful lot of them - but the good ones are still more cost effective than new, branded in a box purchases. My Britool socket set was also extremely good value as secondhand, too, but that was buying good quality at the right time and the right price!

They would not make the things unless the sockets were expected to be used. Certainly more aimed at computer installations than a workshop, perhaps?

A far worse installation could be an extension lead with only two cores....

Edited By not done it yet on 12/02/2018 16:03:49

As far as most internet searches are concerned, none of England, Scotland, Wales or N Ireland are included as countries. We seem to have no choice other than the UK. I am English, nothing else. I may be a citizen of the UK but my nationality is English.

The gauge of something - anything - is a measure of the device, item or whatever.

A petrol gauge in a car usually measures only fractions of fullness of the fuel tank.

The gauge of a shot gun is the number of lead balls (of a specific density) which, when produced from exactly one pound of that lead, are the size of the barrel.

Pressure guages normally have an indicated range.

Rain guages collect water and read off in inches or mm, normally. The collector is much larger than the calibrated vessel.

There is clearly no connection between any of the above guages. Model engineering is no different in that respect.

A railway track was gauged by the width of two horses rear ends, side by side, but is now usually defined in inches for Imperial sized model railways.

There are 12 inches to a foot - no variation on that one! (x is usually an unknown value which needs to be calculated from an equation, or the abscissa on a graph).

As guages are specific to the measurement under discussion, a 6” scale model cannot be compared to a rail guage - no more than the rail guage is comparable (in absolute units) to any other gauge (like a shotgun or pressure gauge).

Clearly, with model trains they have both a scale and a gauge and most people only refer to the one aspect which seems important to them at the time. No different than beekeepers who denote hive boxes as ‘broods’ and ‘supers’ when they are actually deep and shallow boxes (and each can be, and are, used as either brood or honey boxes, dependent on the beekeeper). No different than sloppy electical notations for the cross sectional areas of conducors.

Whenever anyone asks me to spell ‘it’ or ‘that’, they get exactly what they asked for!