I have to hand it to you kb2vxa, you never cease to amaze me with the sheer volume of useless mis-information that you can post.kb2vxa said:Never mind those amateurs with the hole saws, that's the best way to make a ragged hole and tear up any nearby material in the vehicle. Greeley and others make a whole line of chassis punches, 3/8" is the one you want. Simply select the correct size drill bit to pass the bolt, pass it through the pilot hole, reassemble the punch and tighten with a wrench. Out pops the cut-out and the result is a nice clean hole.
Guys, a hole saw is ideal for woodworking but we're dealing with metal here. If you want to cut a hole for a doorknob use a hole saw, otherwise use the proper tools for metalworking.
It is not an odd size, it is just not used as much as the .750 nmo since, by design, it is suppose to only be used in panels up to .128 in thickness.prcguy said:Also, 3/8” is an odd size for an NMO mount, they usually take a ¾” hole.
Either your an amateur or you are not! Be a man, call it like it is. Silly attempts a modesty is just that .. silly.prcguy said:I am still an amateur at this with only maybe 1000 vehicle installs done in a previous life. Hopefully some more experienced people will chime in.
Thats why I mentioned the "unibit". It drills progressively larger holes and de-burrs at the same time. As with anything else, good technique, planning and common sense have to figure in this somewhere.prcguy said:Like others have said, use a sharp drill bit and start with a smaller pilot hole, 1/8” is good and stepping to ¼” and then 3/8” is safer if you’re an NMO virgin.
Actually, not true at all. Although the 3/4" is more common, there are 3/8" mouints readily available. As for a 3/8" mount not seating properly and creating a gap between the antenna and the roof, nothing could be further from the truth. I've used 3/8" nmo mounts for some time, and have never had a "gap" or leak or whatever. 3/8" mounts make sense if you can get to the underside of the roof (or wherever), don't want to drill a huge hole in the car, and/or don't do enough installations to justify the cost of a 3/4" drill bit or hole saw.Also, 3/8” is an odd size for an NMO mount, they usually take a ¾” hole. The NMO was designed to be completely installed from the top of the roof by angling the partially assembled mount down into a ¾” hole, centering a lip in the below roof part into the hole, then screwing the top part down. They can be assembled into a 3/8” hole but they will not seat properly and can create a gap between the antenna and roof.