JeffD
Member
- Location
- cleveland, oh
If you are going to get this inspected the inspector may make you have a field testing angency certify the modified equipment. That is going to cost around $3,000.
FWIW ...
Ordinary general purpose drill bits won't drill copper well at all. That have what is known as a 118 degree point. Look at the bit from the end, and you can see the letter "S" formed by the contours.
What you need to use is a 135 degree "split point" bit. This bit has a flatter point, and when you look at it from the end you see a 'bow tie.'
Drill with a slower speed and greater pressure.
If you are going to get this inspected the inspector may make you have a field testing angency certify the modified equipment. That is going to cost around $3,000.
What determines if this is inspected?Inspector? Thanks.
grading of bolts is not always "more is better". i've seen situations in off road racing
where a grade 12 engine mount bolt, thru bolted, will snap off in an hour of racing,
and the emergency repair piece of 1/2" running thread with two locnuts on it stayed tight
and didn't break for six months.....
same with torque. more isn't always better.... you want the bolt slightly stretched, a
percentage of the amount you can stretch it without failing, like 40% or so. that's how
the torque tables were developed for fasteners.
BTW, if you use the 135 degree bits, be sure to get a good center punch mark. 135 drill bits tend to walk when starting.
If you pull a permit or not.
Anyone happen to have pics or video of this(drill & tap):roll:
I'll check Youtube
Your bookkeeper wants to do work hot, or do you want your bookkeeper in the video because she is hot?I'll see if the bookkeeper will volunteer to make one.
Your bookkeeper wants to do work hot, or do you want your bookkeeper in the video because she is hot?