Tapping: Difference between revisions
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*[[Safety valve]]s | *[[Safety valve]]s | ||
*Other | *Other | ||
==='''Types of Threads'''=== | ==='''Types of Threads'''=== | ||
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*NF (National Fine) | *NF (National Fine) | ||
*NC (National Course) | *NC (National Course) | ||
==='''The Process'''=== | ==='''The Process'''=== | ||
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#*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 | ||
== external links == | |||
[http://www.wikihow.com/Use-a-Tap wikihow's article on tapping] | |||
[[Category:Construction methods]] | [[Category:Construction methods]] | ||
Revision as of 15:14, 14 May 2007
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 diffent thread systems that are used in spudgun construction
- NPT (National Pipe Taper)
- BSP (British Standard Pipe)
- NF (National Fine)
- NC (National Course)
The Process
- Mark and drill an appropriatly sized hole
- The hole should be in an area where fittings or pipe overlap (double thickness)
An appropriate cutting fluid for tapping holes. It is usually available at tool stores. - Find correct hole size with a Tap/Drill Chart
- The hole should be in an area where fittings or pipe overlap (double thickness)
- 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
