跳至主要内容

NC/CNC MACHINING CALCULATING FORMULA

In NC machining or CNC machining working, we always met the different drawings which marked with different machining standard. That require worker to calculate dimensions with different calculation formula.

International Standards

MACHINING CALCULATING FORMULA FOR CALCULATING THE BORE DIAMETER OF THE TAPPING OF EXTRUSION WIRE:

Formula: External diameter of teeth – 1/2 *pitch
Example 1: Formula: M3 * 0.5 = 3 – (1/2 * 0.5) = 2.75mm
M6 x 1.0 = 6 – (1/2 x 1.0) = 5.5 mm
Example 2: Formula: M3 * 0.5 = 3 – (0.5/2) = 2.75 mm
M6*1.0=6-(1.0/2)=5.5 mm.

MACHINING CALCULATING FORMULA FOR ENGLISH TAPPING:

1 inch = 25.4mm
Example 1: (1/4-30)
1/4 x 25.4 = 6.35 (Pitch Diameter )
25.4/30 = 0.846 (pitch)
The conversion from 1/4-30 to metric screw should be M6.35 * 0.846
Example 2: (3/16-32)
3/16*25.4=4.76 ( Pitch Diameter )
25.4/32 = 0.79 (pitch)
The conversion from 3/16-32 to metric screw should be M4.76 *0.79

FORMULAS FOR CONVERTING BRITISH THREAD INTO METRIC THREAD:

Molecular/Denominator x 25.4 =Pitch diameter
Example 1: (3/8-24)
3/8 x 25.4 = 9.525 ( Pitch Diameter )
25.4 24 = 1.058 ( METRIC THREAD )
The conversion from 3/8-24 to metric thread should be M9.525 * 1.058
CNC machining part
CNC machining part

MACHINING CALCULATING FORMULA FOR CONVERTING AMERICAN-MADE THREAD INTO METRIC THREAD:

Example: 6-32
6-32 (0.06+0.013)/Code *6=0.138
0.138 * 25.4 = 3.505( Pitch Diameter )
25.4/32 = 0.635 (pitch)
The conversion of 6-32 to metric thread should be M3.505 * 0.635

1.FORMULA FOR CALCULATING BORE DIAMETER:

External thread diameter- 1/2 * pitch should be:
M3.505-1/2*0.635=3.19
So the inner hole dia. of 6-32 should be 3.19

2.INNER HOLE TAPPING ALGORITHMS FOR EXTRUSION WIRE:

Calculating Lower hole diameter Formula 1:
External pitch diameter – (pitch * 0.4250.475) / code = lower hole diameter
Example 1: M6 *1.0
M6-(1.0 x 0.425) = 5.575 (maximum lower hole diameter)
M6-(1.0 x 0.475)= 5.525 (minimum lower hole diameter)
Example 2: Simple formulas for calculating lower hole diameter of tapped holes by cutting wire:
M6-(1.0 x 0.85) = 5.15 (maximum)
M6-(1.0 x 0.95)=5.05 (minimum)
M6-(pitch * 0.860.96)/Code = Lower hole diameter
Example 3: M6*1.0=6-1.0=5.0+0.05=5.05

Machining Calculating Formula for the External Diameter of Pressure Thread:

Diameter – 0.01 *0.645 *Pitch Distance
Example 1: M3 * 0.5 = 3-0.01*0.645 * 0.5 = 2.58 (external diameter)
Example 2: M6*1.0=6-0.1*0.645*1.0=5.25 (external diameter)

Formula for calculating roll diameter of metric thread: (full teeth)

Example 1: M3 x 0.5 = 3-0.6495 x 0.5 = 2.68 (outside diameter before turning)
Example 2: M6*1.0=6-0.6495*1.0=5.35 (outside diameter before turning)

External Diameter Depth (External Diameter) of Embossing

Outer diameter/25.4 * embossing pitch = outer diameter before embossing
Example: 4.1/25.4 x 0.8 (embossing pitch spacing) = 0.13 embossing depth should be 0.13.

Diagonal Conversion Formula for Polygonal Materials:

Formula 1:
Quadrangle: diagonal radius * 1.414 = diagonal radius
Pentagon: diagonal radius * 1.2361 = diagonal radius
Hexagonal: diagonal diameter * 1.1547 = diagonal diameter
Formula 2:
Four corners: diagonal radius/0.71 = diagonal radius
Hexagonal: diagonal radius/0.866 = diagonal radius

Tool Thickness (Cutter):

material outer diameter/10+0.7 Reference value

Formula for calculating taper:

Formula 1: (Big Head Diameter-Small Head Diameter)/( 2 x
Total Length of Taper) = Degrees
Equal to the value of a triangular function
Formula 2:
(Big Head Diameter-Small Head Diameter)/28.7/Total Length = Degrees
KYLT CNC Machining Services:
KYLT CNC Precision Machined Parts:
More information about Machining Technology:
标签：

评论

发表评论

此博客中的热门博文

KYLT ACS aluminum frame by CNC machining, Precision CNC machining

KYLT One-Stop  CNC Machining Service  Including Custom Finishing Service. On-demand manufacturing,  Machining Metal  & Plastic Parts  Materials. FREE quotation. Parts In As Fast As 1 Day. What is the Advantages of Choose KYLT  CNC Machining services ?  Ability to produce custom-made metal CNC machining parts, CNC machined part with high precision, delivery in time, CHEEP price, FREE quotation, MOQ 1PCS. Over 10 kinds of plastic and metal machining. KYLT provide various types of CNC machining services no matter what your demands or requirements are. We can deliver parts in as fast as 24 hours.  CNC machining service offering instant quotes on high precision custom parts. KYLT CNC manufacturing network provides machined prototypes and mass production. All kinds of plastic, metal Fixture (jig, tooling) making service. CNC quote with FREE, custom parts delivered in time.Rapid C NC prototypes making  and  Precision CNC ma...
发表评论
阅读全文

The advantages of Casting Iron parts used in Corrugated fins forming machine

The advantages of Casting Iron parts used in Corrugated fins forming machine (JTFY 400-1300 TRANSFORMER OIL TANK CORRUGATED FINS FORMING MACHINE KEY MECHANICAL STRUCTURE ALL USE STANDARD GB QT500 CASTING PARTS) Main casting iron structures： ---①②③④⑤ are key casting iron parts Material：Standard GB QT500 --① right&left gantry posts --② slider box --③ slider bottom platen --④ back platen post --⑤ post of cutting structure --other casting iron parts: oil cylinder flange, roller seat, movable mould bearing support,front&back loose-tight structure foot parts etc. transformer oil tank corrugated fins forming machine Casting Iron is naturally weathered. The casting iron part is much heavier than the welding part. The corrugated fin forming machine is one kind of heavy machinery. The smaller vibration of the machine , the greater of cutting precision. The sensitivity of casting iron to vibration is very low, so that its cutting accuracy is improved. Castin...
发表评论
阅读全文

SCREW THREAD MACHINING METHOD

In  Metal parts machining  works, screw thread (tapping) be required. The screw thread is mainly divided into: connecting thread and driving thread For  connecting thread , the main  machining  methods are: tapping, threading, turning, rolling, etc. For  transmission thread , the main  machining methods  are: rough and fine turning – grinding；whirlwind  milling  – rough and fine  turning , etc. CNC turned screw thread part The following describes the various screw machining methods: THREAD CUTTING Generally, it refers to the method of machining thread on workpiece with forming tool or grinding tool, mainly including  turning , milling, tapping, threading, grinding and whirlwind cutting, etc. THREAD MILLING On the thread milling machine, the disc milling cutter or comb milling cutter is used for milling. Disc  milling  cutter is mainly used for milling trapezoid external thread of screw rod, worm and o...
发表评论
阅读全文