Gerald D
Sat 19 January 2008, 21:18
Thought to put this topic on the table to see if we can describe "quality" in the mechanical sense. (Electrical here (http://www.mechmate.com/forums/showthread.php?t=283))
- Deburring, rounding over rough edges. Wearing a blindfold, you must not be scared that you might cut your hand on any part of a machine. You should be able to put your hands in anywhere and it should feel smooth and "polished". A big reason for this is to reduce corrosion - paint does not stick to a sharp edge.
- No signs of corrosion. No surfaces that look if they will corrode. Good corrosion protection. Good paint.
- No small holes or "cracks" in welds - paint won't go in there. It is a corrosion point.
- No grinding marks, especially around welds. That is a lazy way to get a nice looking weld.
- Screw heads un-damaged by wrenches or screw-drivers
- Washers under screw heads or nuts.
- Look as if painted before screws installed. ie. painted under washers. An unpainted washer gives proof of this. (Use zinc coated fasteners (unpainted and un-damaged)
- Turn washers the right way around - sharp edges away from the fingers. (if applicable)
- Use correct length screws. At least one thread showing beyond nut. No more than about 3 threads showing.
- Avoid cutting screws to length (buy the correct length). If you have to cut, then deburr and paint where the zinc is damaged.
Any more?
- Deburring, rounding over rough edges. Wearing a blindfold, you must not be scared that you might cut your hand on any part of a machine. You should be able to put your hands in anywhere and it should feel smooth and "polished". A big reason for this is to reduce corrosion - paint does not stick to a sharp edge.
- No signs of corrosion. No surfaces that look if they will corrode. Good corrosion protection. Good paint.
- No small holes or "cracks" in welds - paint won't go in there. It is a corrosion point.
- No grinding marks, especially around welds. That is a lazy way to get a nice looking weld.
- Screw heads un-damaged by wrenches or screw-drivers
- Washers under screw heads or nuts.
- Look as if painted before screws installed. ie. painted under washers. An unpainted washer gives proof of this. (Use zinc coated fasteners (unpainted and un-damaged)
- Turn washers the right way around - sharp edges away from the fingers. (if applicable)
- Use correct length screws. At least one thread showing beyond nut. No more than about 3 threads showing.
- Avoid cutting screws to length (buy the correct length). If you have to cut, then deburr and paint where the zinc is damaged.
Any more?