Circular Saw Shaft

Schule, Abteilung: HTL Ried im Innkreis, Maschinenbau
Jahrgang: 3. Jahrgang
Lehrer/in: DI Bernhard Flatz, Mag. Erwin Lehner
Schuljahr: 2014/15
Gegenstand: Konstruktion und Projektmanagement
Thema:
Circular Saw Shaft
Activity type/s
1. Listening to the teacher´s introduction.
2. Sketching, designing and calculating a circular saw shaft.
3. Presenting the individual results to the class.
Classroom
format
1. Whole class
2. Individual work
3. Individual work and whole class
Time
6x3 lessons
Procedure
1. Teacher hands out the copies and briefs the students by explaining the tasks.
2. Students work on an individual basis (drafting, calculation, sketching, designing).
3. Students present the outcome to the rest of the group.
Resources
Handouts, Internet, various books (e.g. Mechanical and Metal Trades Handbook /
Europa Lehrmittel, …)
Content-related
learning
outcome
Languagerelated learning
outcome
Students can design and calculate a circular saw shaft.
Students can read for detail.
Students can apply a wide range of technical vocabulary.
Students improve their presentation skills.
Source/s
Note that the student’s version and the teacher’s version is the same as it is an assignment that is
handed out to the students at the beginning of the project and the output is different with every
single student.
CLIL_Konstruktion_Projektmanagement_circular_saw_shaft_09022015_ab_bgo.docx
DI Bernhard Flatz, Mag. Erwin Lehner
1/4
Konstruktion und Projektmanagement - Circular Saw Shaft
Student’s version
Complete the grid by writing down your name and the relevant data.
name:
input speed n (rpm)
input power P (KW)
saw blade diameter D (mm)
bearing distance A (mm)
distance L (blade to belt pulley) (mm)
kind of bearing
bearing sealing
construction of bearing tube
For a circular saw you should design the shaft including the bearing (situation), the bearing tube
and the V-belt pulley.
Calculate:
 cutting force Fc, tangential force of the belt pulley Ft, the bearing forces and the shaft force FW
caused by the belt forces.
 the bending moments and sketch them in two planes
 approximate shaft dimensioning
 bearing for a lifetime of 2000 hours
CLIL_Konstruktion_Projektmanagement_circular_saw_shaft_09022015_ab_bgo.docx
DI Bernhard Flatz, Mag. Erwin Lehner
2/4
Konstruktion und Projektmanagement - Circular Saw Shaft
The documentation must include:
 cover sheet
 instructions (this sheet)
 calculation
 drawings (assembly drawing and single part drawings assigned by the teacher)
Below you see an example for dimensioning.
Please note that the belt forces und the cutting force include an angle of 45° with the table.
CLIL_Konstruktion_Projektmanagement_circular_saw_shaft_09022015_ab_bgo.docx
DI Bernhard Flatz, Mag. Erwin Lehner
3/4
Konstruktion und Projektmanagement - Circular Saw Shaft
name
input speed n
(rpm)
input power P
(KW)
saw blade
diameter D (mm)
bearing distance A
(mm)
distance L (blade
to belt pulley)
(mm)
kind of bearing
bearing sealing
construction of
bearing tube
Specifications:
XXX
XXX
XXX
XXX
XXX
XXX
1450
1450
1450
1650
1650
1650
2
2.5
3.15
4
5
6.3
400
400
500
500
600
600
160
200
250
315
315
400
250
315
400
400
500
500
f
f/l
f
f/l
f
f/l
lab
gap
lab
gap
lab
gap
cast
cast
cast
cast
cast
cast
XXX
XXX
XXX
XXX
XXX
XXX
XXX
XXX
XXX
1650
1650
1450
1450
1450
1650
1650
1650
1650
8
10
2
2.5
3.15
4
5
6.3
8
700
700
400
400
500
500
600
600
700
400
500
200
200
250
250
315
315
400
630
630
315
315
400
400
400
500
500
f
f/l
f/l
f
f/l
f
f/l
f
f/l
lab
gap
gap
lab
gap
lab
gap
lab
gap
cast
cast
weld
weld
weld
weld
weld
weld
weld
annotations:
f
f/l
lab
gap
cast
weld
floating bearing
fixed and loose bearing
labyrinth sealing
gap sealing
cast construction
welded construction
CLIL_Konstruktion_Projektmanagement_circular_saw_shaft_09022015_ab_bgo.docx
DI Bernhard Flatz, Mag. Erwin Lehner
4/4

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