The Power of Checklists

I’ve started using checklists. A few nights ago I made a small, careless mistake and wrecked one of my nice 60 degree milling bits (at $14 a pop). My ‘favorite’ mistakes include: restarting LinuxCNC and forgetting to reload my program forgetting to...

Where has all the power gone?

Most (all?) stepper motor driver instructions include the warning “do not connect/disconnect motors while power is applied”. Curious why? A brief-yet-incomplete intro to stepper motors is appropriate. Stepper motors contain several¬†windings. These windings...

We all make misteaks

I recently assembled 5 PRO 4-axis boards. I’m pretty careful. I follow directions. I am quite familiar with the boards. Only 60% (three out of five for you non-math types) worked first time! Oh the shame. ¬†Careful(er) visual inspection¬†revealed the problems: One...

Tech Support – The Voltages Are All Wrong!

Had an interesting tech support problem last week. The 5 Volt test point measured 4.85 Volts. The test point should be between 4.95 and 5.05 Volts (5 Volts +/- 1%). The output of the LM317HV should be 31.6 Volts, but was measuring out at 30.6 Volts. All the resistor...

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