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Investment Castings

Why Investment Casting?

The investment casting process or lost wax process, can produce the most intricate shapes in just about any alloy. In order to produce & machine these parts, you need to have in depth knowledge of the alloys and much experience...both of which Thompson Investment Casting possesses. There is no other metal working process that provides the design freedom to easily cast complex intricate shapes and assemblies as the investment casting process. The lost wax method out performs any other casting process when it comes to superior surface finishes especially when compared to sand casted, forged or welded fabrications. Some specific benefits are:

  • Reliability
    The investment casting process provides reliable process controls and repeatability that are maintained from casting to casting.
  • Tolerances
    Thompson Investment Casting routinely holds to tolerances of ± .005”. This is not always possible with other types of casting processes.
  • Amortization Lowers Tooling Cost
    The initial wax injection mold to produce the patterns, averaged over the entire production quantity, is often lower than other casting tooling costs. Quality tooling produces a quality part and will be more cost efficient in the long run.
  • Better for the Environment
    An investment casting is produced from 9 wax patterns which in most cases can be reclaimed and used again. The wax pattern is a great way to see your part before it is cast, thus eliminating expensive revisions and reducing metal scrap. More importantly, the investment casting process produces parts to net or near net shapes which significantly reduces or eliminates the amount of secondary machining. Most scrap from secondary services like machining can be reused as well.
  • Design & Casting Versatility
    Thompson Investment Casting works with over 100 different ferrous and non-ferrous casting alloys. This allows our investment casting process to be used in a variety of industries as it produces a wide range of cast and casting based assemblies. Lost wax castings provide the maximum design flexibility for manufacturing complex, multi part products in many cases.
  • Intricate Design
    When using investment castings, design engineers can easily incorporate features such as logos, product ID's/numbers, and letters into their component. Thru holes, slots, blind holes, external and internal splines, gears, and thread profiles can often be cast to reduce secondary machining time and total part cost.

Thompson Investment Casting has engineers ready to help you decide how to best cast your product. Please call us @ 603.330.8670 or email us today

Metal Casting Comparison Chart
  Sand Casting Permanent Molding Die Casting Ceramic & Investment Casting Thompson Investment Casting
Dimensional Tolerances ±.010" ±.030" ±.010"
±.050"
±.001" ±.015" ±.010"
±.020"
±.003 per inch Premium
Relative Cost - High Part Quantity Low Low Lowest Highest Medium
Relative Cost - Low Part Quantity Lowest High Highest Medium Medium
Casting Weight Range Unlimited oz. - 100 lb oz. - 75 lb Ceramic -
3-350 lb.
Investment -
oz. - 100 lb
Less than
1 oz to
25 pounds
Minimum Wall Thickness 1/10" 1/8" 1/32" 1/16" .020"
As Cast Finish
(RMS)
150 - 350 150 - 200 63 - 90 60 - 125 60 - 125
Draft Angle
(Degrees)
1 - 5 2 - 4 1/2 - 2 1/4 - 1/2 =/- 1/4 to 1/2
Design Complexity/Detail Fair-good Fair Good Best Best
Relative Ease of Design
Changes In Production
Best Poor Poorest Fair Good
Castable Alloys Most Ferrous / Non-ferrous Metals Al-base & Cu-base Preferred Al-base Preferred> Most Ferrous / Non-ferrous Metals. Ferrous,
Copper and Copper Based,
Cobalt Based,
Nickel Based,
Aluminum Based

41 Old Dover Road Rochester • Rochester NH 03867

Rochester NH Web Site Design & Development
Contact Info
Call 603.330.8670
Fax 603.332.8942
sthomas@ticasting.com

Thompson Investment Casting can supply your company's investment castings
in the as-cast condition or finish to the print in the many different grades of steel.