Hand Threading and Reaming

Plan and prepare materials and equipment for threading and reaming

*  Interpret the drawing and work instruction for the job

*  Select and mark off the material for the job

*  Tools, equipment and consumables needed

*  Select the correct drill and tap size for the job

*  Prepare the correct cutting fluid

*  Adjust the drilling machine to the appropriate speed (RPM) requirements

*  Apply the correct and safe clamping or fixing method for the work piece

Interpret the drawing and work instruction for the job: Source stock material and cut to approximate. Mark outline and file to size and square Mark out all hole positions Clamp work in drilling machine vice Drill holes to correct sizes Tap drilled holes Remove all sharp edges (burrs) Clean work area and machine. Return all tools and equipment back to its correct place.   Select and mark off the material for the job Select 5 mm flat sheet mild steel material Mark off  size of 192 x 77 mm Cut out using hack saw, guillotine, band saw or jig saw to cut to above size File to adjacent sides square Apply marking blue for clear view of marked of lines Mark out to correct size 190 x 75 mm Using file and engineering square file to above size Mark out centre lines of holes to be drilled using surface table, angle pate and vernier height gauge Centre punch where holes must be drilled  Tools, equipment and consumables needed: Surface table Engineering square Steel Ruler Angle plate Vernier height gauge Scriber Hack saw Marking blue Ball peen hammer Band saw File Centre punch

Select the correct drill and tap size for the job Tap M3 x 0.50 M4 x 0.70 M5 x 0.80 M6 x 1.00 M8 x 1.25 M10 x 1.50 M12 x 1.75   Drill ø 2.50 mm ø 2.30 mm ø 4.20 mm ø 5.00 mm ø 6.75 mm ø 8.50 mm ø 10.20 mm

Prepare the correct cutting fluid

For the drilling process we will use soluble oil as the material is mild steel

For the tapping process we will use a blend of Canola and straight mineral oil

Adjust the drilling machine to the appropriate speed (RPM) requirements

Set the drilling machine to correct speed for each different size drill.  The following factors will be considered: Type of material - the harder the material the lower the speed The size of the drill - the larger the drill the lower the speed and vice versa Cutting speed table for High Speed Steel drills can be used

Apply the correct and safe clamping or fixing method for the work piece  - Videos

There are various claps and clamping methods that can be applied. Factors to consider is the following: The shape of the work The rigidity of the material Clamping pressure Machine tool pressure Finish required  - prevention of clamping damage Direction of machine feed