Recent content by Koth

Hello All I am designing some very basic components for a motorcycle project at home, and because I am interested, thought I'd use it as an opportunity to refresh my memory in order to reduce the risk of the parts failing. To begin, I want to do some basic hand calcs if possible so have...

Thank you. The motor and drive shaft turns freely with little effort, all bearings are good. I'd ask how to test the isolation but think this is covered in one of the other replies so I will comment on that one. Thank you. It does have a capacitor: 10µF ±5% SH, 450V AC 50/60Hz EN60252. Is...

Hi All I am asking this question as a mechanical engineer, so please bare this in mind if you have the time to post a reply... I have a basic DIY type cement mixer that has given up today. It is a AC 230V model with the most basic of drive setups (pulley and drive belt attached to the...

I'll be needing pictures for an engineering report so uploading them here thereafter shouldn't be a problem. Thanks for your input!

Yes, I need a dwell in the fully engaged position, prior to disengagement. Now decided to go down the pneumatic route for this reason. Changed my mind about the solenoid valves! Will now attempt to use an air timer in conjunction with a two way air pilot valve. Hoping to be able to get the...

Thank you very much for this. I am going to cost-up both options. I have a minor quandary, I'd like to have a short dwell after engagement of the plug (1 second). If using the camshaft method, this means that I will need to incorporate a spring at the end of the slider in an attempt to...

Hi, thanks for the advice. Yes 60N is the insertion/extraction force on the plug. I had initially considered doing exactly what you have suggested. However, I have written the idea off for two reasons as follows: 1. I want to be able to carry out the test on 5 samples at once (not previously...

I agree that torque depends on the position of the crank, I am interested in the maximum torque. I think this occurs when the angle between the centre of the crank axle and centre of the connecting rod end (imaginary line between these two points) is perpendicular to the connecting rod. I am not...

Disagree. There is a 60N load at the end of the slider. Surely, assuming no friction, there is a basic formula to calculate how much torque is required to overcome the force exerted on the slider? The radius between the centre of the crank axle and the centre of the connecting rod end, and the...

Also, should be able to control reciprocating speed by increasing or decreasing motor rpm.

I don't want to overcomplicate this, i don't think it's necessary for this particular application. I would like to assume no friction as I will use roller bearings on the connecting rods and maybe on the slider to avoid the need to harden everything. I need between 20mm and 40mm of stroke in...

Hi all The title pretty much says it all... The slider is required to push and pull a load of 70N. Radius between centre of crank axle and connecting rod is 12mm. I have been unable to find a formula to calculate torque required to enable selection of an appropriate motor to drive the...