Difference between revisions of "DIY Laser/XY Gantry"

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{{Archive|date=January 2013}}
  
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=Background=
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RussleH and [[User:Lwk|&#39;RepRap&#39; Matt]] ([[User talk:Lwk|talk]]) took a look at the work is of the IMP Pick and Place at Ciseco<br/>
 
RussleH and [[User:Lwk|&#39;RepRap&#39; Matt]] ([[User talk:Lwk|talk]]) took a look at the work is of the IMP Pick and Place at Ciseco<br/>
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Pictures here<br/>
 
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https://www.dropbox.com/sh/bhjxykpmvo0xxca/QPXxOIEow-/IMP
 
  
 
Locking a magnetic tape linear encoders, simlar to used on the PnP<br/>
 
Locking a magnetic tape linear encoders, simlar to used on the PnP<br/>
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http://www.machine-dro.co.uk/digital-readout-systems/magnetic-tape-linear-encoders.html?p=1
 
http://www.machine-dro.co.uk/digital-readout-systems/magnetic-tape-linear-encoders.html?p=1
  
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=Specifications=
  
 +
Size:
 +
*Minimum working area 600mm x 900mm
 +
 +
Speed:
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*1000m/s for scan (X axis)
 +
*500mm/s for Y axis
 +
 +
Precision:
 +
*0.01mm
 +
 +
=Type of Gantry=
 
Possible driver systems
 
Possible driver systems
  
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* fixed motor driving a ballscrew
 
* fixed motor driving a ballscrew
  
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Motors for each of the above could be one of the following
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Most lower cost laser cutters use belt drives.
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* DC motor
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* stepper motor
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Most larger machines use ball screws.
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* brushless servo motor
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Here are notes on the two ideas:
  
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What speed do we need?
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==Belt Drive==
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* for cut
 
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* for none cut moves
 
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* for etch/scan
 
  
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=Type of Gantry=
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===Advantages===
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*Low cost
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*Standard
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*Motors can be smaller (less inertia)
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*Most low cost and DIY lasers use this method
  
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There has been discussion over the XY gantry system.
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===Disadvantages===
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*Precision will get worse (belt wear)
 +
*Not repeatable precision (belts will stretch if moving fast)
  
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There are two main ideas:
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===Belt Drive costs===
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*Use a belt drive
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*XY gantry for DIY laser is available here for $950 (=£590). The cutting size/ working area is 900mm x 600mm. This comes with 2 x 5A motors.
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*Use ball screws
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http://www.lightobject.com/XLE-900600-XY-Stages-complete-kit-for-DIY-CO2-Laser-2-yrs-warranty-P762.aspx
  
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Most lower cost laser cutters use belt drives.
 
  
−
Most larger machines use ball screws.
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==Ball Screws==
 +
More information on ball screws can be found here:
  
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Here are notes on the two ideas:
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*http://www.cnczone.com/forums/linear_rotary_motion/8813-ballscrew_basics.html
  
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==Belt Drive==
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*http://www.nskamericas.com/cps/rde/xbcr/na_en/Ball_Screw_Tutorial.pdf
  
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===Belt Drive costs===
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===Advantages===
 +
*High precision
 +
*Repeatable precision for its whole lifetime
 +
*Used in commercial designs
 +
*Unusual and interesting - not been done for table top lasers before.
  
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==Ball Screws==
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===Disadvantages===
 +
*Need to build this with high precision
 +
*No DIY design available
 +
*Higher cost
 +
*Larger motors required (more inertia)
  
 
===Ball Screw costs===
 
===Ball Screw costs===
 +
These prices have come from Zapp Automation (http://www.zappautomation.co.uk/en/). This is not necessarily the lowest cost.
 +
 +
Parts required include:
 +
 +
Ball screw 25mm diameter, 25mm Pitch:
 +
*2 x 600mm  @£6/100mm  = £72
 +
*1 x 900mm  @£6/100mm  = £54
  
 +
End mounts:
 +
*3 x floating 25mm diameter @£30 = £90
 +
*3 x fixed 25mm diameter @£60 = £180
  
 +
Ball Nuts:
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*3 x R25-25A2-FSED @£75 = £225
  
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How accurate do we need?
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*3 x Motor couplers @£10 = £30
 +
 
 +
Ground bar
 +
*1 x 1m length @£1.20/100mm = £12
 +
*1 x linear bearings = £4
 +
 
 +
Total cost = £667
 +
 
 +
Notes:
 +
Supplier of ball screws and parts:
 +
*http://www.misumi-europe.com/index.aspx?lang=EN&fn=sub11_3.aspx&mu=06&css=L2&ref=
 +
 
 +
*http://stores.ebay.com/linearmotionbearings/
 +
 
 +
=Type of Motor=
 +
Motors for each of the above could be one of the following
 +
* DC motor
 +
* stepper motor
 +
* brushless servo motor

Latest revision as of 00:06, 20 February 2019

 The information on this page is NOT current. It retained for historical or archival purposes only. (January 2013)

Background

RussleH and 'RepRap' Matt (talk) took a look at the work is of the IMP Pick and Place at Ciseco

Locking a magnetic tape linear encoders, simlar to used on the PnP
This can give very high accuracy position feed back and at high speed

http://www.machine-dro.co.uk/digital-readout-systems/magnetic-tape-linear-encoders.html?p=1

Specifications

Size:

  • Minimum working area 600mm x 900mm

Speed:

  • 1000m/s for scan (X axis)
  • 500mm/s for Y axis

Precision:

  • 0.01mm

Type of Gantry

Possible driver systems

  • Fixed motor and looped belt to carriage
  • Carriage mounted motor and fixed belt
  • fixed motor driving a leadscrew
  • fixed motor driving a ballscrew

Most lower cost laser cutters use belt drives.

Most larger machines use ball screws. Here are notes on the two ideas:

Belt Drive

Advantages

  • Low cost
  • Standard
  • Motors can be smaller (less inertia)
  • Most low cost and DIY lasers use this method

Disadvantages

  • Precision will get worse (belt wear)
  • Not repeatable precision (belts will stretch if moving fast)

Belt Drive costs

  • XY gantry for DIY laser is available here for $950 (=£590). The cutting size/ working area is 900mm x 600mm. This comes with 2 x 5A motors.

http://www.lightobject.com/XLE-900600-XY-Stages-complete-kit-for-DIY-CO2-Laser-2-yrs-warranty-P762.aspx


Ball Screws

More information on ball screws can be found here:

Advantages

  • High precision
  • Repeatable precision for its whole lifetime
  • Used in commercial designs
  • Unusual and interesting - not been done for table top lasers before.

Disadvantages

  • Need to build this with high precision
  • No DIY design available
  • Higher cost
  • Larger motors required (more inertia)

Ball Screw costs

These prices have come from Zapp Automation (http://www.zappautomation.co.uk/en/). This is not necessarily the lowest cost.

Parts required include:

Ball screw 25mm diameter, 25mm Pitch:

  • 2 x 600mm @£6/100mm = £72
  • 1 x 900mm @£6/100mm = £54

End mounts:

  • 3 x floating 25mm diameter @£30 = £90
  • 3 x fixed 25mm diameter @£60 = £180

Ball Nuts:

  • 3 x R25-25A2-FSED @£75 = £225
  • 3 x Motor couplers @£10 = £30

Ground bar

  • 1 x 1m length @£1.20/100mm = £12
  • 1 x linear bearings = £4

Total cost = £667

Notes: Supplier of ball screws and parts:

Type of Motor

Motors for each of the above could be one of the following

  • DC motor
  • stepper motor
  • brushless servo motor
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