Screwed mandrel
Screwed mandrel Screwed mandrel
Screwed mandrel This mandrel is threaded at one end and has a collar. It is used to hold workpieces having threaded holes.
- Page 2 and 3: Step mandrel Step mandrel has step
- Page 4 and 5: MILLING FIXTURE Location - Machine
- Page 6 and 7: Base Thickness 20-25mm Should be
- Page 8 and 9: Different types of milling Single
- Page 10: Strap Clamps Used for holding the
<strong>Screwed</strong> <strong>mandrel</strong><br />
This <strong>mandrel</strong> is threaded at one end and has a collar.<br />
It is used to hold workpieces having threaded holes.
Step <strong>mandrel</strong><br />
Step <strong>mandrel</strong> has step of different sizes of<br />
holes.
Collar <strong>mandrel</strong><br />
This <strong>mandrel</strong> has two collars.<br />
Collars fit firmly into the hole of workpiece.<br />
Collar <strong>mandrel</strong> is lighter in weight.<br />
It is used for holding workpieces having larger diameter<br />
holes.
MILLING FIXTURE<br />
Location – Machine Table<br />
Use – For Clamping Workpiece<br />
Should be Strong and Rigid<br />
Clearance should be provided for<br />
disposal of swarf
Elements of Milling Fixture<br />
Base<br />
Tenon Strip<br />
Setting Block<br />
T – Bolts<br />
Clamping Device<br />
Locating and Positioning element
Base<br />
<br />
<br />
<br />
Thickness 20-25mm<br />
Should be Rigid, absorb cutting forces<br />
Material used – Cast Iron<br />
Tenon Strip<br />
<br />
<br />
<br />
Locate fixture base with reference to milling cutter<br />
Fixes the base of the fixture to machine table in<br />
same relative position every time<br />
Material used – hardened and ground steel<br />
Setting block<br />
<br />
<br />
<br />
With the help of Feeler gauge(used to check positional accuracy)<br />
Use – reduces time for setting milling cutter relative to fixture<br />
Material used – hardened and ground steel
T – bolts<br />
Use – binds fixture to mill table<br />
Clamping Device<br />
Should be rigid<br />
Must not loosen by vibration caused during cutting<br />
Must not interfere during cutting operation<br />
Locating and positioning element<br />
Cylindrical locating pins, diamond locators
Different types of milling<br />
Single Piece Milling<br />
String Milling<br />
Reciprocal Milling<br />
Progressive Milling<br />
Index Milling<br />
Rotary Milling
Dimensional Data of Milling<br />
Dimensions of Milling Machine table<br />
Dimensions of T – Slots<br />
Center to Center distance of T – Slots<br />
Length of Travel in all three fed directions
Strap Clamps<br />
Used for holding the fixture bases(fixture to be used on<br />
more than one machine)<br />
Should be extremely rigid<br />
Should be tight even during more vibrations