Paul Lousick | 30/01/2020 23:48:04 |
2276 forum posts 801 photos | Colin, If you are using one of the column mounted hoists as shown, there should not be a problem with lifting 100kg at 1.5m. The bending moment of listed load at the extended position (neglecting electric hoist) = 1.1m x 200kg = 220 kgm. Your bending moment at 1500mm = 1.5m x 100kg = 150kgm. Therefore OK because less than before. Paul
|
Colin Heseltine | 31/01/2020 10:21:25 |
744 forum posts 375 photos | Paul, Many thanks for the maths response. Good to know the (simple) maths/physics says it is ok. I could not bring the term 'bending moment' to mind. Colin |
Howard Lewis | 31/01/2020 11:38:54 |
7227 forum posts 21 photos | Another thing to bear in mind if extending the lifting arm. Extending it may keep the bending moment within your limits for a vertical lift. But being longer, it will be relatively weaker in the horizontal plane. This needs to borne in mind, as you do not want the arm to bend horizontally as you swing the load from one place onto the machine, or vice versa. Extending the arm by 50% will reduce the horizontal resistance to bending by 70% (BD^3 /12 ) If there is storage space, I would advocate adding additional reinforcements to each side of the extended arm, to prevent any unwanted risks. Howard |
Please login to post a reply.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
Sign up to our newsletter and get a free digital issue.
You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.