Stepper Motors and Specifications for Step Angles

What is the moment of inertia of your load?

What is the required smoothness?

hi,

may i know wat exactly momemt of inertia.

it's for component or for motor

hi, I have to use a stepper motor for lathe head stock to rotate 100 kg crank shaft with 5 rpm.wat type of motor i have to choose and what are the req

moment of inertia is 0.25 kg-m.

Are my eyes deceiving me?

I am sure I've seen this topic posted on several other groups?

Either this one or very similar. Anyway, everytime I see this I ask about inertia and I never get an answer.

Hmmm methinks this may be homework related, perhaps?

hi, I have to use a stepper motor for lathe head stock to rotate 100 kg crank shaft with 5 rpm.wat type of motor i have to choose and what are the req

moment of inertia is 0.25 kg-m.

I am a component of about 100kg and I rotate without a stepper.

Serious now.

Are you allowed to use a drive? (gears / pulleys).

What are you going to use for a driver?

hi,

is it necessary to use a pulley/gear mechanism. if required tell me how to approach

I am guessing that6 the reason for using a stepper is that you want to cut a spiral groove or a oval shaped shaft.

The mechanical driver may still be your best option.

A stepper at 5rpm is a bad idea.

The best torque on a stepper will be at full steps. at 1.8 deg/step (200 steps / rev) 16 steps / sec. is too slow.

A pulley or gear drive will increase the rate of the stepper and torque on the 100 kg shaft.

If you really have too you must also consider a servo with an encoder.

Hai,

Will u suggest the Variable frequency drive is suitable for the applications as said earlier. Also what would be the output torque when we are connecting motor at rpm1400 approx to an output rpm we require is 7?hp of motor=1hp

Can we run 100kg crankshaft between centres by means of frictional transmission of power given to the live centre. and to be run 7 rpm.

Why the stepper?!? What about a DC motor with feedback? A 100kg load is a killer for stepping, when you seem to need rotation. If precision of angle is needed, DC + Shaft encoder gives all the accuracy you might require.

If you think, A stepper will get you the precise angle under load, you are dreaming. A dynamically overloaded stepper will slip and slip again, leaving you in the dark.

5 rpm? Why that speed on a lathe? Why a stepper motor on a lathe? Give us some details, please.

hi,

why 5 rpm means we are using this set up for crankshaft testing to check runouts etc.

hi,

why 5 rpm means we are using this set up for crankshaft testing to check runouts etc. If it is not possible give a solution which will suitable for my set up.

hi,

why 5 rpm means because i am asking is at the top of the machine a rod having dial gauges which takes reading while the crank shaft is running and it checks the runouts.

If i cant load 100 kg crank shaft directly on the motor will u suggest any gear mechanism to achieve that speed and to share the torque

will u suggest variable frequency drive is the better one.

As I keep reading this thread, a chill goes down my spine. A power rotation of an unbalanced large object, and a technician getting close with any instrument is asking for trouble and accidents. Machine shops do measurement with a tabletop testfixture with no power equipment nearby for a reason. I, for one, would not get my micrometer near to a power rotated object for anything!!!

What this guy is asking for, is trouble. Unless he can AMPLY clarify, thats it.

hi,

why because i am asking is at the top of the machine a rod having dial gauges which takes reading while the crank shaft is running and it checks the runouts.

why power means i want to make it as automatic rather hand rotation