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The Omega page that Ed linked to, gives an option for an XL sheath material. It's Omega's proprietary material, rated to 1335 degC/2435 degF. Whilst I do not know whether it will last several times longer when permanently installed in a heavy-use welding forge, it does seem to hold up much...

I'd stick with the 3 kW myself. 6 kW would certainly be faster, but I think it would bring its own problems. I'd be concerned about overheating the blade as a result of direct radiative heating. It is a known issue at tempering temperatures, but that sort of input might make it significant at...

Pillow blocks are often used where precision machining is not practicable. The rolling-element-bearing part of the the assembly often has a spherical outer surface to allow it to align perfectly with the shaft on assembly. Even where the high-speed rolling-element part is sealed, grease is still...

Pretty much every VFD manufacturer and motor manufacturer I've come across recommends using a 4-pole motor and running over a range of 10 Hz to 100 Hz for a usable speed turndown of 10:1. The motor will run at constant torque between minimum speed and rated speed, then at constant power...

It doesn't really matter very much whether you are on on 120V or 220V. The important thing is the power you can get into the oven: Volts times Amps. I am in the UK, where we have 230V domestic supplies, but the standard outlet is only rated for 13A: 2990W 120V, 20A would give you 2400W, so...

I use 4-prong plugs on the machines and a matching socket on the VFD. I have a local control box on a long trailing lead that I can move to the machine I'm using at the time. It has start and stop buttons, a speed control potentiometer and a keyed reversing switch (so I can take the key out to...

Yes it can, like the guys above have said. It generally won't do it particularly well; speeds are often quite a bit lower on metalworking lathes. Tooling, particularly mounting toolrests for largish work, may need a bit of ingenuity, though that's part of what having a lathe is all about...

Plugs have exposed conductors and are used on the device. If it's not plugged in, there's no power on the conductors, so no risk of electrocution if someone touches them. The sockets are used on the power supply side and have fingerproof receptacles, so the live conductors can't be touched when...

I'm way too late to be of any use to the OP, but my understanding of the motor speed issue is as follows: Pretty much every motor manufacturer standardises as many components as they can across the range of motors they offer. It's normal manufacturing practice. They will have a casing...

Sodium Chloride melts at 801 degC/ 1474 degF. Potassium Chloride, as used in "low Sodium" salt, melts at 770 degC/ 1418 degF. One of the problems I have found whilst playing with salt pots on the cheap, is that, although it's nominally Sodium Chloride, table salt tends to have "other...

If I understand it correctly, the fan is only cooling the Solid State Relay. It doesn't need much airflow, so the fan power is minimal. Whichever voltage is least effort will work. If you have the choice between 110V and 220V for the power feed to the elements, 220V is the better option. The...

Sorry, I missed your question the first time around. The formula and numbers are what you want. The values in brackets are just the units you need to be using for the input data. I put them in for clarity :lol: as not everybody thinks in feet, inches and RPM (I'm in the UK and old enough to...

Measuring temperature certainly lets you sidestep a big chunk of the learning curve, and whilst a cheapish thermocouple and readout won't be any better than a good smiths eyeball at getting repeatable temperatures, it won't be any worse either. If you are self taught and/or still learning, a...

The KBAC drives aren't readily available over here, which tends to limit the options. There are dustproof VFDs available, but they tend to cost around twice as much as a "normal" VFD of similar capacity. I've done the thing with mounting IP20 (NEMA 1) drives in IP66 (NEMA 4) enclosures. It...

Your belt speed will be; motor speed (RPM) * motor pulley diameter (") / shaft pulley diameter (") * belt wheel diameter(") * Pi / 12 So for a pair of 432 pulleys and a 4" belt drive wheel, you'd get: High speed: 3600 * 4 / 2 * 4 * 3.14 / 12 = 7536 SFM Mid Speed: 3600 * 3 / 3 *...

No, there's no way to make the speed of a single phase motor variable in a way that'll work well on a grinder. RPM isn't really an issue in itself. Belt speed is. If you fit a 3" drive wheel to a 3500 RPM motor, you'll get the same belt speed as a 6" drive wheel on a 1750 RPM motor. A VFD...

Nice. I have one 4" wide by 24" diameter on the original motor and drive pulleys. Speed is 42 RPM, which gives a surface speed of 3 MPH (2.998 MPH for the really pedantic). Runs in a water trough. You may find a full-length rubber apron a worthwhile investment.