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Valve, Automotive, Marine, Communications, Aircraft, Military and Electronics.

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Investment Casting from Investacast

Investment Casting Tolerances

The tolerance and limitations of Investment Casting dimensions need to be factored in to the design and development of all products. These Investment Casting Tolerances affect the
  • size,
  • angles,
  • flatness and
  • weight
of the materials used for the intended products.

As part of our design process at Investacast we will discuss and explain the Investment Casting Tolerances of the available materials and how they will affect the end product, so that you get the best possible solution for your business. 		 Investment Casting Tolerances and Limits
For more information on Investment Casting Tolerances please read below, or call us on 01271 866200, Email us at info@investacast.com or use our contact form.

Investment Casting Tolerances

Linear

 < 25mm tolerances tighter than ± 0.13mm are achievable dependant on product design and material.
 
 Up to 25mm ± 0.13mm  (up to 1" ± 0.005)
 25mm to 100mm  ± 0.13mm per 25mm
Over 25mm ±13mm per 25mm (over 1" ± 0.005 per inch)


>100mm

Surface Finish Achievable Metric µ    C.L.A.
COPPER BASE ALLOYS 2.0 - 2.5  70-100  
CARBON AND LOW ALLOY STEELS  2.3 - 3.2  90-125  
COBALT AND NICKEL ALLOYS  2.3 - 3.2  70-100  
STAINLESS STEELS  2.3 - 3.2  90-125 
ALUMINIUM ALLOYS  2.0 - 2.5  70-100 

Angular


Angles should not be "toleranced" closer than ± ½º

Holes

 Up to 6mm ± 0.08mm  (up to ¼" ± 0.003)  
 Up to 25mm ± 0.13mm  (up to 1" ± 0.005)
 Over 25mm ± 0.10 per 25mm  (over 1" ± 0.004 per inch)


Concentricity

Outside diameter  18mm 25mm 38mm 51mm
Inside diameter  6mm 13mm 19mm 25mm
T.I.R Eccentricity        0.2mm   0.25mm   0.3mm   0.38mm

Ovality

Diameter up to:   13mm 13mm to 25mm 25mm to 38mm
Ovality T.I.R: 0.25mm 0.3mm 0.4mm
 

Parallelism

Parallel sections of cast features can be “set” to a tolerance of +-0,12mm dependant on material and geometry of product.

Flatness / Straightness

Generally held to ± 0.1mm per 25mm depending on configuration.

Draft Angles

Not required

Ingate Witness

A witness of approximately 0.25mm will be left in the position shown on the marked up drawing sent with our Form Of Supply. Normally we will "Gate" onto surfaces that are subsequently machined or on non Aesthetic faces. Discussions regarding gate positions between Investacasts’ Design Team and the Customer will determine the optimum position for gates.

N.B. All of the above tolerances are achievable with the correctly designed casting and are dependant on alloy selection.  

For more information on Investment Casting Tolerances please call us on 01271 866200, Email us at info@investacast.com or use our contact form.


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