4.3 and 4.4: Fields and Welding

Which kind of components participate in a fit?

• Bore

• Shaft

What is a bore?

• A hole, inner part, Einstülpung, negative space, whatever

What is a shaft?

• A stick, outer part, Ausstülpung, positive space, whatever

What does “play“ imply for a fit?

• Bore is bigger than the shaft

What is another term for “play“ refering to a fit?

• Clearance

What does “oversize” imply for a fit?

• Shaft bigger than the bore

• What are the types of fit? (3)

• Clearance fit (running)

• Transition fit (sliding)

• Oversize fit (press)

What is the maximum play?

• Max. bore - Min. shaft = T_{bore, upper} - T_{shaft, lower} > 0

What is the minimum play?

• Min. bore - Max. shaft = T_{bore, lower} - T_{shaft, upper} > 0

What is the maximum oversize?

• Max. shaft - Min. bore = T_{bore, lower} - T_{shaft, upper} < 0

What is the maximum oversize?

• Min. shaft - Max. bore = T_{bore, upper} - T_{shaft, lower} < 0

Memo-Hint to remember everything:

• Always do Bore - Shaft

• Positive is play, negative is oversize

• Both max and min ends in play is clearance fit, both ends in oversize is oversize fit

• One end in play and the other in oversize is transition fit

How can be a transition fit easily recognised?

• Ends of the tolerance field in opposite sides

Fill the table

• Notice that “Actual Dimension“ and “Actual Play“ is something inbetween

• Notice that the dimension tolerance is the dimension field

What is a gauge?

• An instrument calibrated to measure tolerance fields of shafts or bores

• They have one end for “good“ and other for “reject“

What is this gauge used for?

• To measure tolerance fields for bores

What is this gauge used for?

• To measure tolerance fields for shafts

What is the play zone for a bore of tolerance field H7?

• Any shaft of tolerance field a to h

What is the play zone for a bore of tolerance field (any letter)7?

• Any shaft from a to that tolerance field

How many tolerance fields are in the transition zone?

• 4

What is the transition zone for a H7 bore?

• Shafts with j, k, m, n

• Memo-Hint: after n is the o(versize)

What is the oversize zone for an (any letter)7 bore?

• After any letter + 4 to z

What is the play zone of a h7 shaft?

• Bores from A to H

What is the transition zone of a h7 shaft?

• Bores J, K, M, N (after N is O(versize))

What is the oversize zone of a h7 shaft?

• Bores P to Z

Summary for H/h: Clearance Fits (2)

• Bores H with shafts a to h

• Shafts h with bores A to H

Summary for H/h: Transition Fits (2)

• Bores H with shafts j, k, m, n

• Shafts h with bores J, K, M, N

Summary for H/h: Oversize Fits (2)

• Bores H with shafts p to z

• Shafts h with bores P to Z

Name a general example where oversize fits are used

• Parts joined with pressure or shrinkage techniques (temperature)

• Bush in wheel hub

Name a general example where drive (transition) fits are used

• Parts joined with hammer blows

• Consumibles of tooling machines (gear wheels, belt pulleys, etc)

Name a general example where sliding (transition) fits are used

• Parts assembled by hand with grease

• Frequently replaced parts (bearing shells, change gears)

Name a general example where narrow clearance (play) fits are used

• Parts movable with low play

• Gear wheels in gearboxes, movable clutches

Name a general example where normal clearance (play) fits are used

• Parts easily movable with play

• Common bearing fit/ sliding guides

Which typer of joints are there in welding? (6)

• Butt joint

• Corner joint

• Cross joint

• T-joint

• Multiple joint

• Overlapping joint

What is the name of this joint?

• Butt joint

What is the name of this joint?

• Corner joint

What is the name of this joint?

• Overlapping joint

What is the name of this joint?

• T-joint

What is the name of this joint?

• Cross joint

What is the name of this joint?

• Multiple joint

Which types of seams are there? (10) (Memo-hint: four letters, three halfs, two widely used)

• Bead seam

• I-seam

• Y-seam

• U-seam

• V-seam

• HY-seam

• HU-seam

• HV-seam

• Counterseam

• Fillet seam

What is the meaning of this symbol?

• Bead seam

What is the meaning of this symbol?

• I-seam

What is the meaning of this symbol?

• V-seam (widely used)

What is the meaning of this symbol?

• HV-seam (half V-seam)

What is the meaning of this symbol?

• Y-seam

What is the meaning of this symbol?

• HY-seam (half Y-seam)

What is the meaning of this symbol?

• U-seam

What is the meaning of this symbol?

• HU-seam (half U-seam)

What is the meaning of this symbol?

• Counter-seam

What is the meaning of this symbol?

• Fillet seam (most used)

What is the meaning of this symbol?

• Seam on the joint pointed by the arrow on the side pointed by the arrow

What is the meaning of this symbol?

• Seam on the joint pointer by the arrow on the side pointed by the arrow

What is the meaning of this symbol?

• Seam on the joint pointed by the arrow on the side opposite to the side pointed by the arrow

What is the meaning of this symbol?

• Seam on the joint pointed by the arrow on the side opposite to the side pointed by the arrow

What is the meaning of this symbol?

• Fillet seam on the side pointed by the arrow

• Seam thickness (a) = 10 mm

What is the meaning of this symbol?

• V-seam of 20 mm

Where is specified the length of the seam?

• Right after the symbol

What is the meaning of this notation?

• Interrupted fillet seam

• a = seam thickness

• n = number of seams

• l = length of the individual seams

• e = seam spacing

What is the meaning of this notation?

• Interrupted offset fillet seam

• a = seam thickness

• n = number of seams

• l = length of the individual seams

• e = seam spacing

• v = initial distance (distance of the first seam)