DIY Laser/XY Gantry: Difference between revisions

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{{Archive|date=January 2013}}
=Background=
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/>
Pictures here<br/>
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


=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
Possible driver systems


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* fixed motor driving a leadscrew
* fixed motor driving a leadscrew
* fixed motor driving a ballscrew
* fixed motor driving a ballscrew
Motors for each of the above could be one of the following
* DC motor
* stepper motor
* brushless servo motor
What speed do we need?
* for cut
* for none cut moves
* for etch/scan
=Type of Gantry=
There has been discussion over the XY gantry system.
There are two main ideas:
*Use a belt drive
*Use ball screws


Most lower cost laser cutters use belt drives.
Most lower cost laser cutters use belt drives.


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


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


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


===Belt Drive costs===
===Belt Drive costs===
*XY gantry for DIY laser is available here for $950. The cutting size is 900mm x 600mm
*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




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===Advantages===
===Advantages===
*High precision
*High precision
*Repeatable precision for its whole lifetime
*Used in commercial designs
*Used in commercial designs
*Unusual and interesting - not been done for table top lasers before.
*Unusual and interesting - not been done for table top lasers before.
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*Need to build this with high precision
*Need to build this with high precision
*No DIY design available
*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:
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:
*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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