Open Source Lathe: Difference between revisions

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=Introduction=
=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]].
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 [http://opensourcemachine.org/the-multimachine/multimachine-video Multimachine]. Instead of an engine block as the basic structural unit, we'll be using a concrete bed with metal mounting plates.


=Design Rationale=
=Design Rationale=

Revision as of 21:08, 28 January 2009

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:

Clamps.jpg

Chuck

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

Chuck.jpg

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 Pto motor.jpg

Shaft Coupler from motor to shaft

Bill of Materials - Lathe

    • Romig bed lathe type - from Multimachine - Romig.jpg
    • 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