MadModder

I'd like to make an interval timer for my Harbor Freight 220 volt spot welder.  I have a couple of timers coming in the mail. They use mechanical relays. Here's a pic:

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Specifications:
 Operating voltage: DC 6V - 30V, supporting micro USB 5V power supply
 Operating current: 50mA, static current: 20mA
 Working temperature: -20—60℃
 NO maximum load: < AC 250V/10A, < DC 30V/10A
 Size: 6.4*3.8*1.7cm

HOWEVER:

I'm guessing that triggering the inductive load of the 220V line of the spot welder might be too much for the relay, so I was going to add a second solid state relay, which would be triggered from the timer's relay. Maybe this one....

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Twidec/Output Single Phase SSR Solid State Relay
100A
3-32V DC to
24-480V AC
SSR-100DA

BUT, I was wondering if I could eliminate the middle man (the timer's mechanical relay) maybe desolder it and then just hard wire the relay coil's lines to the inputs of the 100 amp solid state relay?

Thanks

Yeah, scotch yoke seems to be easy one to animate/simulate properly, as the location of A (piston/conrod connection point in previous image), can be set to copy B's (yoke) location, by limiting its following behavior to consist only B's Z-axis movement.

To change gears - Although Blender's simulation/physics engine (Bullet) has some major issues with glitches, it can still be used for spotting/avoiding the same (tedious and probably takes too much effort to figure out what seemingly random errors are).

Nevertheless, there may be moments, when simulation runs as expected. An example, where vehicle drives around in circles, having its speed measured:

End cap removed:

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The cap and back end of transformer windings

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The fixed handle and trigger wire running down channel to the switch:

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Switch with ring of paper insulator

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Switch wiring

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Switch construction

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Switch contacts

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Looking good a very interesting clock , it will be good to see how it performs . Mike

The conrod is always vertical in a scotch yoke, but at a varying angle to the piston in a crankpin connection. Except at TDC and BDC. So the vertical distance is shorter in between.