Turret Lathe Tooling Layout
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Turret Lathe Tooling Layout
Turret Lathe Tooling Layout -
(i) Set up time
(ii) Work handling time
(iii) Machine Controlling time,
(iv) Cutting time
(v) Tool cost
(vi) Setup labor cost
(vii) Lathe operator labor cost
(viii) Number of parts to be manufactured.
Factors (i) to (iv) affect the arrangement of the tools in the turret and tool holders.
Factors (v) to (viii) relate to the cost of producing parts on the turret lathe and thus determine whether turret should be used for the said purpose or not.
(i) Set up time is the time required for a skilled tool setter to set the various cutting tools and work holders in the turret lathe, adjust them to produce the desired dimensions on the workpiece, and set the various stops. Set up time should be as short as possible for maximum production. This may be achieved by using standard too] holders and tools.
(ii) Work handling time is the time required for putting work into and removing it from the turret lathe. Power chucks and automatic bar feeding may help in reducing work handling time.
(iii) Machine controlling time is that required to manipulate the controls which reverse and rotate the turrets, change speeds and so on. Machine controlling time may be reduced by combining operations in a single turret position, etc.
(iv)Cutting time is that during which chips are produced cutting time can be reduced by working at optimum speeds and feeds and by making simultaneous cuts.
The next step is to:
(i) Prepare the finished drawing of the part to be manufactured.
(ii) Select tool holders and tools such as drills, boring bars reamers etc., for the necessary machining operations.
(iii) Decide length of travel of the tools and position of stops.
(iv) Select proper cutting speeds and feeds for each operation.
(v) Set the work, tool holders and tools on the turret lathe.
Turret Tooling for a Threaded Adapter
| A - Tap | C - Ream R | E - Drill |
| B - Recess | D - Bore A | F - Start Drill |
The various operations are:
1. The bar stock is advanced against the combination stock stop and start drill and is clamped in the collet chuck. The start drill is advanced and the end of the workpiece centered.
2. The turret rotates; drill at 2 takes the position earlier occupied by start, drill 1. Drill 2 drills the bole in the bar stock (workpiece) up to the required length.
3. Turret rotates, boring bar, 3, takes the horizontal position and bores thread diameter. The boring bar in a slide tool is used.
4. Turret rotates, reamer 4, occupies horizontal position opposite to the workpiece and the already drilled hole is reamed to size.
5. Turret rotates, and the recessing tool comes in front of the workpiece and a groove for thread clearance is recessed. For this operation a quick acting slide tool is used with a recessing cutter mounted in a boring bar.
6. Turret again rotates and the tap 6 comes in front of the workpiece and the internal threads are cut.
After operation 6, a parting tool held in the rear tool post does the cutting off operation and the threaded adapter separates from the bar stock. The collet chuck opens, bar stock is advanced again and operational steps from 1 to 6 above repeat to produce the next workpiece.
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