Tool Calculator

When driving a screw, pilot holes stops the wood from splitting. If it does split, it takes glue and dowels to fix a piece of … Read more

The devil’s in the details, Forstner bits demonstrate this. You get everything lined up looking like it will be perfect and you begin drilling with … Read more

Want to know exactly which RPM your workshop machine should be spinning at for any given project? This calculator lets you input diameter, material SFM … Read more

This calculator is a good tool if your working with standard inch and metric fasteners. Many times, bolts fail not at the exposed part of … Read more

Of all the measurements on a threaded part, the one that counts most is it’s pitch diameter. Thats what wears out and fits into another … Read more

Thread engagement length is one of those deceptively simple details that separates a joint that lasts from one that slowly works itself loose or suddenly … Read more

Looks simple, right? A socket head cap screw is just a screw with a socket on top. But drop it into a machined pocket and … Read more

One thing you need to keep in mind is that your twist drill has a point on it. That means there’s a little bit of … Read more

A screw pull-out strength calculator can help you know wheather your joints will support a load or fail before you put in the first screw. … Read more

Lag screw withdrawal calculator quickens shop connection inspection by estimating withdrawal capacity based off service factors, thread penetration, shank diameter, and wood specific gravity. Stood … Read more

At zero resistance in perfect conditions, fans are rated for how much air they can move. In the real world there is resistance, resistance from … Read more

Air flows from the grille, across the coil, through a filter, then along a ductwork run to a fan. Every one of those items decreases … Read more

To get the airflow you expect, you must calculate the systems resistance, measured in inches of water gauge. Failure to do so result in a … Read more

Before you resize or balance your HVAC branch, try this calculator: Use a flex-duct static-pressure calculator. It will help you compare accessory losses, compression, bend … Read more