Okay this has has been driving me crazy.

I would like to know how a conveyor speed can be calculated on the basis of chain pitch, sprocket PCD & no. of teeth and output RPM of gearmotor.

So here is a practical example I'm having to solve at the moment:

I have to drive a conveyor at a speed of 760mm/min. To drive this, I am using a drive system which consists of a small sprocket mounted on the output shaft of the gearbox. This sprocket is connected to a larger sprocket by means of a chain.

A shaft from the larger driven sprocket is connected to the main conveyor sprocket on which the conveyor chain is mounted. This chain needs to be driven at 760mm/min or in other words, the part at one station needs to travel to the next station 760mm away in one minute.

I have enclosed a sketch of this arrangement for reference.

I am going to use a VFD to achieve the required speed. Available specifications:-

Motor Speed - 915 RPM (6-pole)

Gearbox Reduction - 73.6 (this I am yet to finalize, Can go for a different reduction ratio if required)

Output RPM - 12.43

PCD of Small drive sprocket - 106.14mm

No. of teeth on small drive sprocket - 13

PCD of large driven sprocket - 461mm

No. of teeth on large driven sprocket - 57

PCD of conveyor sprocket (mounted on same shaft as driven sprocket) - 598mm

No. of teeth on conveyor sprocket - 74

Chain Pitch - 1"

Any help for this would be highly appreciated!

Thanks,

KV

I would like to know how a conveyor speed can be calculated on the basis of chain pitch, sprocket PCD & no. of teeth and output RPM of gearmotor.

So here is a practical example I'm having to solve at the moment:

I have to drive a conveyor at a speed of 760mm/min. To drive this, I am using a drive system which consists of a small sprocket mounted on the output shaft of the gearbox. This sprocket is connected to a larger sprocket by means of a chain.

A shaft from the larger driven sprocket is connected to the main conveyor sprocket on which the conveyor chain is mounted. This chain needs to be driven at 760mm/min or in other words, the part at one station needs to travel to the next station 760mm away in one minute.

I have enclosed a sketch of this arrangement for reference.

I am going to use a VFD to achieve the required speed. Available specifications:-

Motor Speed - 915 RPM (6-pole)

Gearbox Reduction - 73.6 (this I am yet to finalize, Can go for a different reduction ratio if required)

Output RPM - 12.43

PCD of Small drive sprocket - 106.14mm

No. of teeth on small drive sprocket - 13

PCD of large driven sprocket - 461mm

No. of teeth on large driven sprocket - 57

PCD of conveyor sprocket (mounted on same shaft as driven sprocket) - 598mm

No. of teeth on conveyor sprocket - 74

Chain Pitch - 1"

Any help for this would be highly appreciated!

Thanks,

KV

Hi All,

I mainly come from a pressure vessel background where vessel are designed to conform with ASME Div 8 or PD5500. I was wondering if there is a similar standard for pressure systems either hydraulic or pneumatic? We want to design a hydraulic system for pressure testing hoses of 1/2" to 1".

Any information is greatly appreciated.

Thanks

]]>I mainly come from a pressure vessel background where vessel are designed to conform with ASME Div 8 or PD5500. I was wondering if there is a similar standard for pressure systems either hydraulic or pneumatic? We want to design a hydraulic system for pressure testing hoses of 1/2" to 1".

Any information is greatly appreciated.

Thanks

I am sure this problem has been addressed in some application but I don't know where to look. Here is what I want it for. I designed and created a two point swivel for my "dog run". I have two huskie and did not want to fence in a large outdoor kennel. I put in an overhead cable running about 100' from the house to a tree, placed a trolley on the cable, a swivel on the bottom of the trolley and a bracket holding two 25' retractable cable leashes in the bracket. They can run and play without getting tangled. See photo.

The challenge! I now have three huskies. Somehow I need to attach three of the retractable leashes such that they can't get wrapped around each other. Any ideas?

The challenge! I now have three huskies. Somehow I need to attach three of the retractable leashes such that they can't get wrapped around each other. Any ideas?

Ok, so im having some trouble modelling a problem mathematically.

I am designing a suspension system for a truck. It will consist of a variable rate spring and a double sided rack and two pinions on roller clutches either side of the rack. The rack and pinion setup will drive a flywheel which will drive a generator. The double sided rack and pinions on roller clutches will make it possible to achieve a uni-directional motion of the flywheel irregardless of there being a positive or negative displacement of the rack. The rack will be attached directly to the axle and it is hoped that the rack and pinion driving a generator will act as the damping for the system.

I am having trouble modelling the system mathematically. I have decided to input a road profile as a sine wave and chose a pinion radius. Mapping the displacement of the rack from its zero position allows me to calculate the rpm of the pinion but I am unsure of how to map the varying torques being transferred to the system from the rack. Here is my initial calculations on excel. These are rough obviously just so i can begin sizing parts.

Any help would be much appreciated, completing this for my final year project and my supervisor is useless.

Best Regards, George

I am designing a suspension system for a truck. It will consist of a variable rate spring and a double sided rack and two pinions on roller clutches either side of the rack. The rack and pinion setup will drive a flywheel which will drive a generator. The double sided rack and pinions on roller clutches will make it possible to achieve a uni-directional motion of the flywheel irregardless of there being a positive or negative displacement of the rack. The rack will be attached directly to the axle and it is hoped that the rack and pinion driving a generator will act as the damping for the system.

I am having trouble modelling the system mathematically. I have decided to input a road profile as a sine wave and chose a pinion radius. Mapping the displacement of the rack from its zero position allows me to calculate the rpm of the pinion but I am unsure of how to map the varying torques being transferred to the system from the rack. Here is my initial calculations on excel. These are rough obviously just so i can begin sizing parts.

Any help would be much appreciated, completing this for my final year project and my supervisor is useless.

Best Regards, George

Hi

I'm new to this forum. I work in industry and am currently studying part time for my BEng aswell. We're doing a short design project based on powerscrew mechanics, and I was wondering if someone could shed some light on mechanics of horizontal powerscrews?

Specifically, I'm having difficulty with the Torque required to move a load along a horizontal power screw. We've already done a vertical powerscrew, and the vertical calculations are all sorted (thanks to Shigley's Mechanical Design). I've used the information in that book to derive equations for Torque required for the horizontal powerscrew, but one comes out negative. I have trialled different FBDs and derivations but one always ends up negative.

I've attached an image with a sketch of the scenario, in case I haven't explained it clearly enough.

I've also attached my derivations of the horizontal power screw torque equations from FBDs. This document also contains the values I'm using, showing that Torque(right) comes out negative.

I've checked everything I know to and am completely stuck! Any ideas?!

Thanks in advance!

I'm new to this forum. I work in industry and am currently studying part time for my BEng aswell. We're doing a short design project based on powerscrew mechanics, and I was wondering if someone could shed some light on mechanics of horizontal powerscrews?

Specifically, I'm having difficulty with the Torque required to move a load along a horizontal power screw. We've already done a vertical powerscrew, and the vertical calculations are all sorted (thanks to Shigley's Mechanical Design). I've used the information in that book to derive equations for Torque required for the horizontal powerscrew, but one comes out negative. I have trialled different FBDs and derivations but one always ends up negative.

I've attached an image with a sketch of the scenario, in case I haven't explained it clearly enough.

I've also attached my derivations of the horizontal power screw torque equations from FBDs. This document also contains the values I'm using, showing that Torque(right) comes out negative.

I've checked everything I know to and am completely stuck! Any ideas?!

Thanks in advance!