Difference between revisions of "Tapping"
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*Other | *Other | ||
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| − | + | ==='''Types of Threads'''=== | |
| − | * | + | There are a few different thread systems that are used in spudgun construction |
| + | |||
| + | *NPT (National Pipe Taper) | ||
*BSP (British Standard Pipe) | *BSP (British Standard Pipe) | ||
*NF (National Fine) | *NF (National Fine) | ||
*NC (National Course) | *NC (National Course) | ||
| − | |||
| − | #Mark and drill an | + | ==='''The Process for metal'''=== |
| − | #*The hole should be in an area where fittings or pipe overlap (double thickness) | + | |
| + | #Mark and drill an appropriately sized hole | ||
| + | #*The hole should be in an area where fittings or pipe overlap (double thickness)[[Image:ReltonRapidTap.jpg|right|thumb|An appropriate cutting fluid for tapping holes. It is usually available at tool stores. ]] | ||
#*Find correct hole size with a [http://www.engineersedge.com/tap_drill_chart.htm Tap/Drill Chart] | #*Find correct hole size with a [http://www.engineersedge.com/tap_drill_chart.htm Tap/Drill Chart] | ||
#Insert the tap into the tap wrench | #Insert the tap into the tap wrench | ||
| Line 24: | Line 26: | ||
#Cut the threads | #Cut the threads | ||
#*Be careful to keep the tap straight or you will end up with crooked threads | #*Be careful to keep the tap straight or you will end up with crooked threads | ||
| − | #* | + | #*When tapping plastic (or any other material) be sure to use an appropriate [http://www.relton.com/html/cutfluid2003.html cutting fluid] such as RapidTap® made by [http://www.relton.com/ Relton]. |
#*Apply downward pressure while slowly turning the tap clockwise 180 degrees, then back out 90 degrees counterclockwise to clear the chips | #*Apply downward pressure while slowly turning the tap clockwise 180 degrees, then back out 90 degrees counterclockwise to clear the chips | ||
#*For tapered threads, stop as soon as the entire length of the hole is threaded | #*For tapered threads, stop as soon as the entire length of the hole is threaded | ||
| + | |||
| + | '''Process for plastic''' | ||
| + | |||
| + | When taping into plastic a pipe tap is unessasary. | ||
| + | |||
| + | #Drill hole slightly smaller than your fitting. | ||
| + | #Hold your fitting with a wrench and slowly turn it into the plastic, be sure to keep it straight. | ||
| + | #After the fitting is threaded in completly remove the fitting. | ||
| + | #Wrap teflon tape around the threads | ||
| + | #Thread the fitting back into your hole. | ||
| + | |||
| + | == external links == | ||
| + | [http://www.wikihow.com/Use-a-Tap wikihow's article on tapping] | ||
[[Category:Construction methods]] | [[Category:Construction methods]] | ||
Latest revision as of 15:29, 27 December 2010
Tapping is the process of cutting threads on the inside diameter of a hole with a tool called a tap. It is used to thread holes for mounting:
- Pressure gauges
- Fuel meters
- Electrodes (Bolts)
- Safety valves
- Other
Types of Threads
There are a few different thread systems that are used in spudgun construction
- NPT (National Pipe Taper)
- BSP (British Standard Pipe)
- NF (National Fine)
- NC (National Course)
The Process for metal
- Mark and drill an appropriately sized hole
- The hole should be in an area where fittings or pipe overlap (double thickness)
- Find correct hole size with a Tap/Drill Chart
- Insert the tap into the tap wrench
- If you don't have a tap wrench, a normal crescent wrench can be used
- Cut the threads
- Be careful to keep the tap straight or you will end up with crooked threads
- When tapping plastic (or any other material) be sure to use an appropriate cutting fluid such as RapidTap® made by Relton.
- Apply downward pressure while slowly turning the tap clockwise 180 degrees, then back out 90 degrees counterclockwise to clear the chips
- For tapered threads, stop as soon as the entire length of the hole is threaded
Process for plastic
When taping into plastic a pipe tap is unessasary.
- Drill hole slightly smaller than your fitting.
- Hold your fitting with a wrench and slowly turn it into the plastic, be sure to keep it straight.
- After the fitting is threaded in completly remove the fitting.
- Wrap teflon tape around the threads
- Thread the fitting back into your hole.
