How to Use Wall Fixings
Masonry pins must always penetrate a surface at right angles. A heavy hammer, such as an engineer’s pattern, is needed, and firm, well-placed blows should be used.
The nail should be long enough to penetrate at least 19mm into the main surface and not less than 13mm, or it may backlash or break in the wall.
Boring and fixing tools
A hand boring tool, or ‘jumper’, and a heavy hammer should be turned slightly with each blow in a clockwise direction. The weight of the blow should be gauged in accordance with the hardness of the material. Light, sharp blows and frequent turning will achieve results more rapidly. A too-heavy hammer used on a tool of small diameter may cause it to snap or jam.
As a guide, the weight of the hammer should be about 340 grammes for No. 6 or No. 8gauges and about 677 grammes for No. 12 gauge or heavier. If there is a danger of flying particles, wear protective goggles.
Piston-and-cylinder fixing tools
Piston-and-cylinder fixing tools take a variety of fixing pins, which are muzzle loaded into the mouth of the cylinder. The tool is then held flat to the surface and struck with hammer blows on the piston, which recoils after each strike in preparation for the next blow.
These tools can also be used for driving in masonrymade with threaded heads to take a variety of domed or hexagon nuts.
For many jobs around the home, the ordinary tipped masonry bit, up to about 8mm diameter, can be used in hand or in power tools.
A rotary drill bit, unless diamond tipped, may jam between particles. Standard domestic electric drills can be fitted with rotary percussion attachments, and some makes of drill are dual purpose-both rotary percussion and standard.
Care must be taken to use a suitable speed when boring into brickwork or masonry, the most common surface materials.
To bore holes from 13mm to 38mm diameter, heavier core or trepanning bits are suggested. These are basically tubes with hardened cutting teeth set around the circumference at one end.
A shallow hole cutter can be used for larger holes. This consists of a tungsten-carbide tipped trepanning tool with a pilot drill for accurate centring which sinks holes of up to 89mm diameter to a depth of 50mm.
For drilling very deep holes, extension pieces are available whichinto certain types of drill bit.
When working with hand or power tools, ensure that the drill bit is sharp and in good condition. Squeaking is a sign of bluntness, coupled with a drop in performance. Working with a blunt tip can over-load the.
If the bit tip turns blue, it means that excessive speed has been used and the temper of the steel will be ruined. Masonry bits can be resharpened at home, but this can be done professionally and many manufacturers provide for at least one free sharpening after purchase.
10. November 2011 by admin
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