Our testing has proven that not only will you break fewer taps, but the quality of the tapped holes is significantly better when tapping with a power tapper. Learning to use the power tapper is the best solution of all. It is also a good idea to clean out the flutes occasionally when tapping deep holes. We recommend that you use piloted taps when tapping deep holes. Use a loose drill bit to check the angle of the drilled hole before starting to tap. Tap misalignment is the single most common reason for tap breakage. It is very important to drill and tap at the same angle. QUESTION: What can I do to prevent tap breakage?
#Bullet castmaster series
In almost all cases C Series pins will be sufficient to strengthen this type of crack. QUESTION: Do I need locks when repairing long cracks in automotive engine blocks? Blow away any sealant that could be trapped at the surface before the shoulder seats into the surface. Use the countersink with L Series pins to seat the shoulder a little deeper. QUESTION: How can I improve the finish I am getting on valve seats and other machined surfaces?
You can also snug them up and cut the head off to avoid over torquing in thin material. This helps them tighten without stripping.
#Bullet castmaster install
Install the pins one at a time so that each new pin is touching a previously installed pin. When faced with thin material, do not use the Pin Spacing Drill Jig. Either your spotface is too deep or the material is just too thin. This is caused by not having enough threads engaging the casting. QUESTION: What causes C Series pins to strip when tightened? But when there is a though hole, you must use the spotfacer. In fact, that is the strongest installation for C Series pins. QUESTION: Can C Series pins be installed in blind holes without the shoulder? Peening them with a needle scaler makes it look like a raised weld bead and works best. Leaving the shoulders protruding 0.020" to 0.050" above the surface can help. QUESTION: Can I leave some of the C Series shoulder above the surface to add strength instead of grinding them smooth when working on thin material? The minimum thickness of a casting for C1 pins is 0.125" and for C2F it is 0.200" Spotfacing reduces the thickness of the material that is left for thread installation. Thin material is also a challenge for C Series because of the need to spotface the installation hole. QUESTION: Where are places that I can't use C Series Pins?Ĭ Series pins cannot be installed at an angle greater than 20 degrees from perpendicular to the surface. A good example of a perfect place for L Series pin installation is the valve seat area of cylinder heads. Cracks running along an inside or outside corner need to be repaired with C Series pins.īecause the L Series pins exert spreading pressure when tightened they are used when there is enough strength in the surrounding area to contain them.
#Bullet castmaster crack
QUESTION: When should I use C Series pins and when can I use L Series Pins?Ĭ Series pins are used for structural repairs and/or when spreading pressure would cause the crack to extend. Do I need locks when repairing long cracks in automotive engine blocks?.
How can I improve the finish I am getting on valve seats and other machined surfaces?.What causes C Series pins to strip when tightened?.Can C Series pins be installed in blind holes without the shoulder?.Can I leave some of the C Series shoulder above the surface to add strength instead of grinding them smooth when working on thin material?.Where are places that I can't use C Series Pins?.When should I use C Series pins and when can I use L Series Pins?.Print This Page Email This Page Cast Iron Repair & Metal Stitching Frequently Asked Questions In-house and On-site Machining Services.
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