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In 1986 I was attending an Army Satellite terminal training class? at Ft. Gordon, GA. Had a bad storm that night that shut down our terminal. I'd been writing a letter on the Heathkit. H89 computer

Yep. Higher the frequency the lighter the wiring can be. Back in the day, aircraft electronics were run at 400hz, instead of the 60hz we use in households and industry. Switching would save a lot on

It's what I mentioned about modern power supplies, an inverter welder is a SMPS (Switched Mode Power Supply).? It converts the mains power to DC.? Then Switches that at a high frequency.? This

I wonder how make they make inverter welders so light today. It was Aluminum winding onsecondary side now they lighter. Now it is high frequency is about what know. Dave

Higher frequency uses less iron, not copper. It has to do with how much magnetic field the transformer core can hold. Slower frequency means more time to charge the core, so more iron needed. Modern

I noticed at first the 25 amp breaker. That is only 6,000 watts. My home is only 100 amp main at 240 center Tap 120 is 24,000 watts. I have wonder why 50 or 60 Hz . If up frequency you drop copper

I guess the UK ?? is different than my chart. Make more sense. My chart shows American is 117 volts if go check it 121 volts. Dave

In the UK the power is 240V, 50Hz.? Outlets are often wired in a ring, not just one linear connection. Here we have 220V, 50Hz.? On the poles is 3 phase WYE, so 220V from any leg to the common and

I agree The color code has always been problematic. This one happen to me. Everyone knows green ground and black is hot. But at one time in electronics black was ground and green was high voltage. The

Note that color codes have changed over the years, so you have to match the color chart with the year your building was wired.? I hear the UK really swapped colors around. Always check with a meter,

I had one cross reference at time for European, UK , JAPAN,? CHINA & and few other countries. I do not know what happened but found on internet around 1998. But retirement I did think I need that

Sorry for delay My doctor gave me antibiotic third time in last 6 months I walk out and took a few photos of real tapper attachment. Dave

The following items have been added to the Files area of the [email protected] group. * /5) Charts & Tables for machine work/2drill-tap-chrat.pdf (

The following items have been added to the Files area of the [email protected] group. * /5) Charts & Tables for machine work/7-three-wire.pdf (

davesmith1800 <davesmith1@...> added folder */5) Charts & Tables for machine work* *Description:* A list of charts and tables use by machinist . It best use a 3-RING BINDER and plastic

The following items have been added to the Files area of the [email protected] group. * /4) Upgrades for mini lathes/cross slide screw Jan 16 23.jpg (

The following items have been added to the Files area of the [email protected] group. * /1) Lathe manuals/1~) Fast info/1) Chang Gear Calc Nov 30 2023 (1).html (

Here the chuck bolt to the rotary table. The apdator has pilot on to if into the tablet. This use outside of for easy setup. Dave

Does anyone have a cross reference from usa metal standards to European ones?? Like W1 drill rod being U8A (or У8А locally). When I search for metals I keep finding various stainless but not so

*Here one on ROTARY TABLES* *I just found today.?* . The accuracy of TABLE are from *20* *seconds* to 80 seconds or 1 minute 20 seconds The digital from LMS is *70 seconds or 1 minute 10 seconds.*