When drilling in stone to prevent overheating of the drill bit and tip consider using water as a coolant.
Herb, KV4FZ On 8/11/2012 9:22 AM, W2PM wrote: > Be real careful when drilling at those seam points tho as the bit can get > stuck when hitting the harder area around the joint and if your holding on > with both hands it will twist your arms around real good. > > Sent from my iPad > > On Aug 10, 2012, at 16:20, "ZR" <[email protected]> wrote: > >> Rent a hammer drill with a 1/2" or 3/4" bit and an extension. Takes about 15 >> minutes a hole as long as you have AC out there. My 3/4" bit is 12" long and >> Ive used it several times to bust up big boulders at or near the surface in >> the yard. >> >> Start at a point where there is space between 2 rocks to minimize the >> effort. This is a job where you sit on the ground to work and then lay down >> when tired and keep drilling! >> >> Carl >> KM1H >> >> >> ----- Original Message ----- >> From: "Herb Schoenbohm" <[email protected]> >> To: "N2TK, Tony" <[email protected]> >> Cc: "'topband'" <[email protected]> >> Sent: Friday, August 10, 2012 3:32 PM >> Subject: Re: Topband: Radials over a stone wall >> >> >>> Tony, no need to fret about drilling. I would say than going under is >>> better than going over. The crews who do direct burial for cable TV and >>> fiber have special directional drill attachments that you should try to >>> borrow. the will go straight down along the wall until they get to the >>> dirt under the wall, find their way under the wall and come up on the >>> other side. You just a need a few of these connector and for them it is >>> something they do all the time under highways, concrete drainage and >>> sidewalks, as a matter of their work. >>> >>> If you want to DIY you could also excavate as much as possible on both >>> sides, take some 8 foot ground rods and drive them at an angle drive >>> with a sledge on each side and see if you can "establish contact". Fill >>> both sides of the pilot holes with rock salt, the water them for several >>> days. Eventually you should have a fairly low resistance connection >>> from one rod to the other, even if they do not touch. Connect you >>> radials to both ground rods. Only problem with the rock salt is it will >>> eventually each away at the copper covered steel rod. But you should be >>> good for a year or two. >>> >>> Before I get royally flamed here and subjected to humiliation by not >>> having this advice peer reviewed, let me suggest that this method has >>> never been tested by me and probably not by anyone else. >>> >>> >>> Herb Schoenbohm, KV4FZ >>> >>> >>> >>> >>> >>> >>> On 8/10/2012 2:21 PM, N2TK, Tony wrote: >>>> Thanks Bill and Herb about drilling a hole through the wall. That could >>>> be >>>> tough. It is a stone wall with no mortar. It is about 20-28" thick. It is >>>> well constructed with large field stones. It would be rough to drill >>>> through >>>> all of that. I had thought about taking portion of the wall apart but >>>> figured I would never get it back to looking as good as it does now. The >>>> stones go fairly deep so not much chance of going under the wall. >>>> >>>> 73, >>>> N2TK, Tony >>>> >>>> -----Original Message----- >>>> From: Bill Wichers [mailto:[email protected]] >>>> Sent: Friday, August 10, 2012 12:26 PM >>>> To: N2TK, Tony; topband >>>> Subject: RE: Topband: Radials over a stone wall >>>> >>>> I would expect an "up and over" to clear the wall would result in a >>>> choke-like effect on the radial and would, at best, reduce the radial's >>>> effectiveness. >>>> >>>> It should be easy to just drill some small (maybe 1/4"?) holes through >>>> the >>>> wall in a few places to pass the radials through. With a decent hammer >>>> drill >>>> and a carbide bit a small hole like that is pretty quick and easy to >>>> complete -- even in concrete or stone. Then just use a piece of >>>> coathanger >>>> wire as a wire fishing tool to run the radials through the hole. >>>> >>>> I use a wire pulling tool called a "creep-zit" to pull radials under >>>> fallen >>>> trees and logs in the woods. It works great. I basically just take one of >>>> the 6 foot long fiberglass rods (each of which is a little over 1/8" >>>> diameter), tape the radial to one end, and then I can push it under >>>> fallen >>>> debris easily. With a little practice you can even get around hidden >>>> obstructions in the ground this way. >>>> >>>> -Bill >>>> >>>> >>>>> I shunt feed my tower for topband. I use variable vacuum caps and a >>>> vacuum >>>>> relay at the base to switch between the low end and the high end of >>>> the >>>>> band. It seems to work okay. I have 100' buried radials spaced 10' at >>>> the >>>>> ends from o degrees going clockwise through about 220 degrees. I have >>>> a 4' >>>>> high stone wall that runs about 20/200 degrees that is about 35' at >>>> its >>>>> closest point to the tower. So the radials are progressively shorter >>>> on >>>>> the >>>>> West side of the tower. >>>>> >>>>> >>>>> >>>>> I am making an assumption that going up over the wall will distort any >>>>> benefits of extending the radials on the West side? Is that a true >>>>> assumption. >>>>> >>>>> I can't really have the radials go from the tower base up at an angle >>>> to >>>>> clear the stone wall and continue on. If I am to extend them the >>>> radials >>>>> would have to go on the ground to the wall then up and over and back >>>> down >>>>> to >>>>> the ground. >>>>> >>>>> >>>>> >>>>> 73, >>>>> >>>>> N2TK, Tony >>>>> >>>>> _______________________________________________ >>>>> UR RST IS ... ... ..9 QSB QSB - hw? BK >>>> _______________________________________________ >>>> UR RST IS ... ... ..9 QSB QSB - hw? BK >>> _______________________________________________ >>> UR RST IS ... ... ..9 QSB QSB - hw? BK >>> >>> >>> ----- >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 10.0.1424 / Virus Database: 2437/5191 - Release Date: 08/10/12 >>> >> _______________________________________________ >> UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
