This is a website for the standard dimensions of I-beams, rectangular hollow section beams flanges etc.
http://www.roymech.co.uk/Useful_Tables/Sections/steel_section_index.htm#tables
Saturday 20 March 2010
Friday 19 March 2010
Hand Winches
Gear Ratio
One person can't lift 1000kg using a hand winch without a gear ratio of at least 14:1 so that to the person using the winch it would feel like lifting 71.4kg. This is because the amount that an average man man weighs is 60-70kg and the maximum most people can lift is their own body weight.
Maximum Capacity
The winch needed for this design would have to have a maximum capacity of 1000kg or 2200lbs.
Weight
The winch needs to be a suitable weight so that it can be transported manually from the 4x4 vehicle to the disaster area.
Brakes
As the maximum load to be lifted will be 1000kg the winch needs to have a brake so that the person using the winch has time to rest and when the load is at the required height the winch can be locked.
These are the sites of suitable hand winches:
http://www.winchsystems.co.uk/sf-2200-hand-winch.php
http://www.winchsystems.co.uk/sf-5000-hand-winch.php
One person can't lift 1000kg using a hand winch without a gear ratio of at least 14:1 so that to the person using the winch it would feel like lifting 71.4kg. This is because the amount that an average man man weighs is 60-70kg and the maximum most people can lift is their own body weight.
Maximum Capacity
The winch needed for this design would have to have a maximum capacity of 1000kg or 2200lbs.
Weight
The winch needs to be a suitable weight so that it can be transported manually from the 4x4 vehicle to the disaster area.
Brakes
As the maximum load to be lifted will be 1000kg the winch needs to have a brake so that the person using the winch has time to rest and when the load is at the required height the winch can be locked.
These are the sites of suitable hand winches:
http://www.winchsystems.co.uk/sf-2200-hand-winch.php
http://www.winchsystems.co.uk/sf-5000-hand-winch.php
Thursday 18 March 2010
Additional points for crane specification:
Whilst looking at the initial sketch of the crane it is very important to take into the account the following :
1) The weight of the crane :
A crane which is going to lift 1000kg in weight is not going to be easy to lift as the boom and base will be quite heavy. Therefore it is essential that hollow sections are used for the struts etc. This will decrease the weight of the crane and can still give a reasonable amount of strength. The materials associated would be alluminium or steel. Alluminium would be more desirable but may be more expensive.
2) Hand winch
If you can lift 1000kg then we can make this crane just for u, hoooooowever, it is likely that you can not lift such a weight. The winch in the design would be manual rather than any other option hence we need some kind of a gear system for the winch . Maybe at a 15 to 1 reduction ratio reducing the amount of load from 1000kg to 66 kg etc etc.
3) Standard sections
All diameter of holes need to fit standard sections/tolerences. This would give ease when manufacturing such parts.
1) The weight of the crane :
A crane which is going to lift 1000kg in weight is not going to be easy to lift as the boom and base will be quite heavy. Therefore it is essential that hollow sections are used for the struts etc. This will decrease the weight of the crane and can still give a reasonable amount of strength. The materials associated would be alluminium or steel. Alluminium would be more desirable but may be more expensive.
2) Hand winch
If you can lift 1000kg then we can make this crane just for u, hoooooowever, it is likely that you can not lift such a weight. The winch in the design would be manual rather than any other option hence we need some kind of a gear system for the winch . Maybe at a 15 to 1 reduction ratio reducing the amount of load from 1000kg to 66 kg etc etc.
3) Standard sections
All diameter of holes need to fit standard sections/tolerences. This would give ease when manufacturing such parts.
Pay-load for a Landrover Defender:
The website I found the following information on:
http://www.landrover.com/gb/en/lr/defender/explore/defender-professional/
"Dropsides
The Defender 130 Dropside in either Single or Double cab format provides huge load carrying capacity and a whole lot more. The corrosion resistant body is constructed from aluminium with zinc plated catches and corner pillars. The totally flat, wheelarchless load floor with hinged removable side boards, back boards and corner pillars all make for fast and easy load management. With a payload of 1200kg through, class-leading towing capability of up to 3500kg and optional tipper functionality, this is a truly remarkable load carrier."
This is relevant to the group becasue it gives us a maximum weight for our crane structure when it is dis-assembled for transport.
http://www.landrover.com/gb/en/lr/defender/explore/defender-professional/
"Dropsides
The Defender 130 Dropside in either Single or Double cab format provides huge load carrying capacity and a whole lot more. The corrosion resistant body is constructed from aluminium with zinc plated catches and corner pillars. The totally flat, wheelarchless load floor with hinged removable side boards, back boards and corner pillars all make for fast and easy load management. With a payload of 1200kg through, class-leading towing capability of up to 3500kg and optional tipper functionality, this is a truly remarkable load carrier."
This is relevant to the group becasue it gives us a maximum weight for our crane structure when it is dis-assembled for transport.
Minutes: 18/03/10
Tasks followed up:
- Individual designs verbally SWOT analysed by all of group. (Individual design drawings photographed and posted on blog.)
- R.D's design was deemed most appropriate solution and its SWOT analysis was noted.
- Design issues were then discussed and resolved and dimensions for the crane were established. This was in order to facilitate the group members going away and 're-designing' the 'initial design' with stress and bending moment analysis.
- Types of winch - electronic or hand, examples of both brought to meeting, costings and weights of mechanisms requested.
Tasks for next meeting:
- All group members to return with fully analysed free-body diagram of proposed crane design for comparison.
- Group members are also to look into bearing design for rotation of crane as well as faesible materials for the manufacture of the crane components.
Future Meetings:
Mon 22/03
Thurs 25/03
Attendees:
A. Compton
J. Collins
A. Dhillon
R. Dhillon
A. Daniels
Photographs of sketches brought to meeting by members:
- Individual designs verbally SWOT analysed by all of group. (Individual design drawings photographed and posted on blog.)
- R.D's design was deemed most appropriate solution and its SWOT analysis was noted.
- Design issues were then discussed and resolved and dimensions for the crane were established. This was in order to facilitate the group members going away and 're-designing' the 'initial design' with stress and bending moment analysis.
- Types of winch - electronic or hand, examples of both brought to meeting, costings and weights of mechanisms requested.
Tasks for next meeting:
- All group members to return with fully analysed free-body diagram of proposed crane design for comparison.
- Group members are also to look into bearing design for rotation of crane as well as faesible materials for the manufacture of the crane components.
Future Meetings:
Mon 22/03
Thurs 25/03
Attendees:
A. Compton
J. Collins
A. Dhillon
R. Dhillon
A. Daniels
Photographs of sketches brought to meeting by members:
Tuesday 16 March 2010
Types of Cranes Research
The different types of cranes available was researched to give a broad idea of the different designs currently in use.
Minutes 16/03/10
Minutes: 16/03/10
Gantt Chart Distributed
Tasks Allocated (See Gantt Chart post)
Tasks for next meeting:
Produce Designs for crane x2
Inc. Materials Cost research, Basic Calculations etc.
Prepare for SWOT analysis of designs.
Future meetings:
Thur 18/03
Mon 22/03
Attendees of todays meeting:
A. Compton
J. Collins
A. Daniels
R. Dhillon
Gantt Chart Distributed
Tasks Allocated (See Gantt Chart post)
Tasks for next meeting:
Produce Designs for crane x2
Inc. Materials Cost research, Basic Calculations etc.
Prepare for SWOT analysis of designs.
Future meetings:
Thur 18/03
Mon 22/03
Attendees of todays meeting:
A. Compton
J. Collins
A. Daniels
R. Dhillon
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