Open Source Lathe

Introduction

Here we are showing the details for fabricating a high-performance (2/1000" accuracy), high power (20 hp) lathe. It will be powered from the hydraulic take-off from a tractor - LifeTrac. The design follows that of the Multimachine. Instead of an engine block as the basic structural unit, we'll be using a concrete bed with metal mounting plates.

Design Rationale

• High power, simple design
• OSE Specifications are met via low cost for replication; a transparent, open source development process; open documentation; product evolution infrastructure
• External power source
• Interchangeable motor - part of LifeTrac infrastructure, motor can be coupled to many different devices
• Hydraulic motor provides high power and torque with full speed control via a flow control valve
• Basic design is two bearings with bearing clamps holding bearings in place:

Chuck

We will fabricate a chuck from a 1" steel pate, as in:

Cross Slide

For the lathe to be able to handle large work pieces, the cross slide itself - which holds the tool post.

Tool Post

The tool post will have to mount securely to the cross slide.

Motor

Brute 20 horse of turning power is provided by a hydraulic motor powered by LifeTrac

Bill of Materials - Lathe

• • Romig bed lathe type - from Multimachine -
  • Simple prototype, $486 in materials BOM:
    • 2 bearings, $50
    • 2 mouning plates, 1/2"x6" angle - $40
    • 4 Shaft Collars - $20
    • 2" shaft - $20
    • DOM tubing, 3", 2" ID - $15
    • 8 3/4" bolts for table - $16
    • Chuck plate - $40
    • Bolts for chuck - $20
    • Nuts and bolts for DOM - $5
    • XY table - $70 off shelf at Enco - [1]
    • Tool post - $10
    • table plate - $30
    • 2 bags of cement, 80 lb each - $20
    • sand, gravel - $10
    • TOTAL - $316
  • High performance, 2/1000" accuracy with proper technique, stock parts, 1000 lb radial and 200 lb axial load capacity