Page 571 - Dormer

GENERAL HINTS

PROGRAMMING WITH Rprg

• For easy adjustment of the thread tolerance always program with radius correction
• The Rprg value is the start value for a new cutter and is printed on the cutter shank. This should be entered in the
tool memory offset
• Rprg is based on the theoretical zero-line of the thread meaning that when you program using Rprg the thread is
never oversize, but normally tight

• This means that with a small modification to the program co-ordinates you can create the thread to the required
size

RECOMMENdATIONS

• Always use the correct cutting data (refer to the cutting data chart on page 198)
• Use the recommended drill size for the thread diameter, as for conventional taps

• For easy adjustment of the thread tolerance always start with the Rprg value printed on the shank of the threadmill
• Use a gauge to check the tolerance on the first thread to establish if the radius needs to be corrected. The radius
can be corrected 2 or 3 times before the threadmill is worn out
• When dry machining, compressed air is recommended to help with swarf removal

• When threading more difficult materials, it is recommended to take 2 or 3 passes

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