How are keyway depths measured?
Metric keyways are dimensioned by width and depth as measured from the radius of the shaft to the center of the keyway.
How deep do you cut a keyway?
Milling of keyway Layered milling is to cut the keyway layer by layer, the depth of each operation is only 0.5-1 mm, then carry out the back and forth milling with a larger feed rate until it reaches the desired depth.
What is a P9 tolerance?
The second is a P9 tolerance. This is an undersized clearance. The advantage of the Js9 tolerance is that the key can be inserted and the gear manipulated without much difficulty. Whereas the P9 tolerance is a press fit tolerance. Once the key is inserted into the keyway, it is not going to move.
How big should a keyway be?
Metric – Rectangular B.S. 4235 : PART 1 : 1972
| Nominal Shaft Diam | Key Size | |
|---|---|---|
| 65 | 75 | 20 x 12 |
| 75 | 85 | 22 x 14 |
| 85 | 95 | 25 x 14 |
| 95 | 110 | 28 x 16 |
How are shaft keyways cut?
A notch called a keyway is cut on the inside of the gear along with another notch cut, longways, into the shaft. Then and a piece, usually metal, called a key is inserted into the shaft keyway. The gear can then be fitted onto the shaft and the keyway on the gear will fit over the key, inserted in the shaft.
What does H8 tolerance mean?
H8 (hole) tolerance range = +0.000 mm to +0.039. f7 (shaft) tolerance range = −0.050 mm to −0.025 mm. Potential clearance will be between +0.025 mm and +0.089 mm.
How do you determine keyway?
Look at the large end of the key (also called the bow). If the bow has straight sides and a triangle-shaped top (like a house), you probably have a KW1 keyway. If the key is diamond-shaped (narrower at the top and bottom and wide in the middle), you probably have a SC1 keyway.
When the thickness of a key reduces along its length?
A sunk key is a key in which half of the thickness of key fits into the keyway in the shaft and half in the keyway of the hub. The sunk keys are of the following types: Rectangular sunk key: It is the simplest type of key and has a rectangular cross-section. A taper of about 1 in 100 is provided on its top side.
What tool is used to cut a keyways?
A key cutter, also known as a keyseat cutter, keyway cutter, or woodruff cutter, is a versatile tool that can be used to cut several different types of keyways.
When the thickness of key reduces along its length?
What is an f7 tolerance?
Clearance fits f7 (shaft) tolerance range = −0.050 mm to −0.025 mm. Potential clearance will be between +0.025 mm and +0.089 mm.
What is H7 h6 tolerance?
U7/h6. For example, using an H7/p6 press fit on a 50mm diameter: H7 (hole) tolerance range = +0.000 mm to +0.025 mm. p6 (shaft) tolerance range = +0.042 mm to +0.026 mm.
What is the effect of keyway cut into shaft?
A little consideration will show that the keyway cut into the shaft reduces the load carrying capacity of the shaft. This is due to the stress concentration near the corners of the keyway and reduction in the cross- sectional area of the shaft. It other words, the torsional strength of the shaft is reduced.
What is the tolerance for shaft key seat depth control?
Shaft Key Seat Depth Control Values S and T for Shaft and Hub ANSI B17.1 Keyseat Alignment Tolerances: A tolerance of 0.010 inch, max is provided for offset (due to parallel displacement of keyseat centerline from centerline of shaft or bore) of keyseats in shaft and bore.
What is the size of a keyway bore?
Keyway Bore Diameter Size Bore Reference -0.000 / +0.010 Height (d) (t) – DIM Keyway Width (w) AGMA 9002-A86 Inch Bore and ANSI B17.1 Square Keyway Tolerances
What is Table 1 in keyway tolerance?
Table 1 details the appropriate key slot and key sizes for various metric bores. Please note that the key sizes in parentheses are older sizes that are no longer commonly used. As noted above, when selecting a keyway tolerance, there are two common selections in the metric system.
What is the straightness tolerance of the keyways?
Straightness Tolerance = .012″ per foot, .006″ typical. Straightness is not guaranteed. Special straightness bars available. *All keyways meet the ANSI B17.1-1967 (R1998) standard.