'n Twee-gang vierkantige skroefraadstaaf moet vervaardig word. Die stygting van die skroefraad is 40 mm en die kruindiameter is 85 mm. Die vrylpohoek moet 3° wees. Bereken die volgende: 10.1.1 Gemiddelde diameter 10.1.2 Helikshoek van die skroefraad 10.1.3 Ingryphoek (Voorsnyhoek) van die beitel 10.1.4 Sleephoek (Nasnyhoek) van die beitel FIGUUR 10.2 toon 'n metrieke V-skroefraad. A. Benoen A–D. 10.3 Noem TWEE gebruike van 'n vierkantige skroefraad.

NSC Mechanical Technology Fitting and Machining ISO metric V tread: 'n Twee-gang vierkantige skroefr

'n Twee-gang vierkantige skroefraadstaaf moet vervaardig word - NSC Mechanical Technology Fitting and Machining - Question 10 - 2021 - Paper 1

Question 10

'n Twee-gang vierkantige skroefraadstaaf moet vervaardig word. Die stygting van die skroefraad is 40 mm en die kruindiameter is 85 mm. Die vrylpohoek moet 3° wees. ... show full transcript

Worked Solution & Example Answer:'n Twee-gang vierkantige skroefraadstaaf moet vervaardig word - NSC Mechanical Technology Fitting and Machining - Question 10 - 2021 - Paper 1

Step 1

10.1.1 Gemiddelde diameter

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Answer

To calculate the mean diameter ( D_m), we use the formula:

D_m = D_{OD} - rac{P}{2}

Where:

$D_{OD} = 85 ext{ mm}$
P (Pitch) = 40 mm
Using the number of starts = 2:

Thus,

D_m = 85 - \frac{40}{2} = 75 ext{ mm}

Therefore, the mean diameter is 75 mm.

Step 2

10.1.2 Helikshoek van die skroefraad

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The helix angle ( $\theta$ ) can be calculated using the formula:

\tan(\theta) = \frac{\text{Lead}}{\pi \times D_m}

Where the lead is equal to the pitch (40 mm). Therefore:

\tan(\theta) = \frac{40}{\pi \times 75}

Calculating this gives:

\theta = \tan^{-1}(0.169765272) \approx 9.63° \text{ or } 9°38'

Step 3

10.1.3 Ingryphoek (Voorsnyhoek) van die beitel

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The leading tool angle is given by the formula:

\text{Leading tool angle} = 90° + \text{helix angle} + \text{clearance angle}

Substituting:

Helix angle = 9.63°
Clearance angle = 3°:

\text{Leading tool angle} = 90° + 9.63° + 3° = 77.37° ext{ or } 77°22'

Step 4

10.1.4 Sleephoek (Nasnyhoek) van die beitel

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The following tool angle is calculated using:

\text{Following tool angle} = 90° + \text{helix angle} - \text{clearance angle}

Substituting:

Helix angle = 9.63°
Clearance angle = 3°:

\text{Following tool angle} = 90° + 9.63° - 3° = 96.63° \text{ or } 96°38'

Step 5

10.2 Benoen A–D

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A. Pitch diameter/mean/effective B. Helix angle C. Pitch/Lead D. Root/Root length

Step 6

10.3 Noem TWEE gebruike van 'n vierkantige skroefraad

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Vice screws
Brake screws

Additionally, 3. Lead screws of lathe machines 4. Scissor jacks 5. Milling machine table feed screws 6. Hydraulic jacks (Adjustable top)

'n Twee-gang vierkantige skroefraadstaaf moet vervaardig word - NSC Mechanical Technology Fitting and Machining - Question 10 - 2021 - Paper 1

Worked Solution & Example Answer:'n Twee-gang vierkantige skroefraadstaaf moet vervaardig word - NSC Mechanical Technology Fitting and Machining - Question 10 - 2021 - Paper 1

10.1.1 Gemiddelde diameter

10.1.2 Helikshoek van die skroefraad

10.1.3 Ingryphoek (Voorsnyhoek) van die beitel

10.1.4 Sleephoek (Nasnyhoek) van die beitel

10.2 Benoen A–D

10.3 Noem TWEE gebruike van 'n vierkantige skroefraad

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