Referring to all the carpenters in a random post, Dave Mariette from Guilds of Metalsmith’s Gallery, recently stressed on the use of drill press for tapping operations, whenever possible. Drilling holes is perhaps one of the commonest tasks performed by masons, carpenters, blacksmiths and architects. Professionals use hand drills because they’re easier to use. However, they are not accurate. Drill press is an efficient and practical substitute. It is preferred over hand drills when we have to mark the location and orientation of the hole correctly.
Drilling Machines—A Brief Introduction
Drilling machines are versatile in nature. They range from small sized, manually operated power drills to larger floor-mounted and bench-mounted models. They’re used for various purposes like tapping holes, counter-boring, deburring and reaming holes. They may consume lots of space in our basements, but they make our task much faster and easier.
5 Reasons Why A Worker Must Have A Drilling Machine With Him
1) Speed & Accuracy
5) Safe Operations.
Checklist For Drilling Hole
Tips on Tapping on a Drill Press
In order to drill a hole, you must have the following accessories with you
1) Drill Press
Experienced professionals prefer a central drilling machine with thick shaft and minute flutes in it. It makes a firm contact with the surface and easily penetrates it. You may require allIcutting fluid’ (a sort of lubricant) used for easy penetration.
Taps are small, triangular tools with sharp cutting edges to cut threads. They have straight flutes for expelling chips and bits. They are blunt at one end and slightly tapered towards the other end. Since they are hard and brittle, one needs to handle them very carefully.
Taps are of various types—bottoming tap, taper tap and plug taps. Taper taps consist of a bundle of chamfer threads that form a pointed end, which inserts into the surface whereas plug tap has less number of threads. Similarly, bottoming taps have two chamfer threads at their pointed end.
Drill operators prefer taps with reduced diameter shanks. The point is if they break the tap by chance, it will detach just above the hole. Thus, you can easily remove it
3) Threads & Dies
Lead threads and dies used for tapping must conform to a standard shape. This parameter is defined by the UNC (Unified Thread System) for distinguishing coarse (UNC) and fine (UNF) threads. Threads differ, based on crest and shape of the root.
Since you have all the accessories to start the task, let’s go through the instructions.
Things To Consider While Tapping A Hole
1) Firstly, you need to mark the point where you want to drill a hole. If the hole is too large (more than half inch in width), it’s important that you drill a smaller pilot hole. Pilot holes are bored around half of the initial hole width.
2) Add tapping attachments to prepare the drilling machine. Use your finger or a allIcenter finder’ to mark the point where you line up the center of the spindle in conjugation with the hole.
3) The sleeve automatically turns around, every time the drill machine is elevated. This way, the tapped threads are well-preserved.
4) After selecting a tap, compare its size with the diameter of the hole. It should be a perfect fit. You may use conversion charts to convert metric measurements on the tap and the drill bit.
5) Take your time to chamfer the hole before you start tapping on it. This keep taps in an upright position and reduces stress on the threads.
6) Lastly, use tapping fluid for lubricating the tap. Switch on your drill press and descend the taps into the hole. If you’ve set everything in the right manner, it’ll take only a couple of seconds for the tap to thread the hole.
Deburring & Reaming Holes
Since the bottom edge of the hole is not as clean as the top edge, we insert a deburring tool into the hole and run it around the edges, applying moderate pressure. Secondly, we can use a reamer for greater precision (generally required for &Islip fits’ and alllinterference fits’). Make sure that you drive it down with a constant, slow speed, to mark an undersized hole.
Now that you know how to use a drill machine, you can conveniently tap a hole. Nevertheless, you must remember to follow relevant safety precautions for setting up machines and handling, maintaining or servicing tools. If you handle your machines correctly, you’ll prevent any mishaps at your workplace.