23 gauge pin fails to penetrate White oak
I'm building Craftsman style window trim from White oak. The casing stiles are 7/8" thick and installed on jamb extensions, both made of White oak. Because the walls are wavy the stiles will need to be shimmed to the wall and the gaps concealed by a separate back band scribed to the wall. My principal method of attachment of the casings to the jamb and jamb extensions is to nail them with 16 gauge 1 1/2" trim nails, using a Paslode gas trim nailer. My plan was, however, before shimming and final nailing, to position and fasten the stile casings flush and square to the jamb extensions with two or three 23 gauge, 1 3/4" pins to avoid splitting the stiles by nailing too close to the reveal lines. I have a Grex 650 pin gun that has served to pin the ceiling-to-wall White oak molding you see in the first photo atttached, without a problem.
The Problem: Grex recommends a compressor discharge pressure of 110 PSI for 1 3/8" or longer pins into hardwood. With pressures ranging from 110 to as much as 125 pounds I've repeatedly jammed my pin gun because the pin will stop proud of the casing surface by almost a 1/4" and then bounce back enough to jam the gun's ram, requiring a partial disassembly.
I finally gave up on pins for the job, switched to the gas gun and held my breath while nailing within 1/2" of the reveal line, just enough nails to hold the casing in place until I could get everything shimmed up.
The Question: Does anybody have experience with pins in hardwoods of similar thickness (7/8" or so) to tell me whether the tool is wrong for the job or whether I'm doing it wrong? (NB the second photo is erroneously rotated so the ceiling is to the left)
In the land of the blind, the one-eyed man is king.
Last edited by sonofSon; 08-25-2020 at 02:39 PM.