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Thanks everyone for such an overwhelming response. Never imagined that there are so many ways to measure it. Sorry that I cannot thank you guys much sooner. I tried doing this and I was able to get some measurement. Easiest Method Thanks IRstuff for the method and I tried it. Clicked some...

Below is the image of a hot steel rolling mill roll having V Groves. I am trying to measure the length of each side of the grove as shown in the figure accurately. Currently I am using a normal ruler but as you can see it not accurate. Any other proper way of measure the grove length...

Sorry for such a late response. Thanks again everyone for helping me in clearing doubts regarding VFD. Jraef, thanks for letting me know about "slip recovery system". But as LionelHutz told - It wont help in my case and slip recovery system requires a huge capital investment as well. Thanks...

Thanks everyone for so timely replies. It really helped me a lot to understand VFD and it's concept behind energy saving. Thanks waross, LionelHutz, FacEngrPE, prdpks2000, edison123 and especially jraef in making all of this so clear. Thanks a lot! I have now decided NOT to invest in VFD drive...

Currently it's being turned on via OCB and LRS (electrolytic starters or Liquid Resistance Starters (LRS). Both OCB and LRS requires frequent maintenance when used only two - three times daily. It takes around a minute for the motor to gain enough speed so that slip ring can be shorted. Hence...

Rated motor current is 563AMP. Attached name plate below Reversing Operation is not required. During production, Motor runs in full speed, at idle operation, it can run at low speed.

Thanks for replying Yes, it's a wound rotor motor. Slip rings are connected to resistance during the starting of motor which are ultimately shorted after starting operation of the motor. During the idle operation i.e. for 40% of the time, 20-30% of load, motor speed can be reduced to a very...

Thanks. I converted the video to gif and uploaded as a photo.

Currently using 335 KW 3 Phase Inductor motor (415V 563A 740 RPM) without any VFD in Hot Rolling Mill. Thinking about investing in VFD to drive the above motor to enjoy saving due to VFD. The motor operates in 20%-50% load for 50% percent of time. The current peaks up to 800-900 A for 1 seconds...

My current project involves steel reheating in a small continuous furnace for rolling.(3 Tons/Hour - Pulverized Coal Fired) I'm now stuck at somewhat bizarre problem . Achieving homogenous heating is getting difficult and is somewhat random. There are two situation which confuses the most - 1.)...

I have tried changing the excess air but still no results. Actually it isn't smoke, maybe it's an extension to the flame as you can see in the figure given below( Sorry for bad drawing). What is more troubling is why these foggy Fumes/POCs are moving in the opposite direction?? I have checked...

Currently I'm involved in a steel Re-heating continuous furnace project for heating billet , scraps. It's pulverized Coal fired having two zones - soaking and heating zones. Secondary air of soaking zone burner is preheated (recovered heat from Draft) The problem is that whenever coal...