Tombstones, fixture plates, trunnion tables, and more that hold the tightest tolerances in the industry.
AMROK, the workholding division at AME, has built a steady reputation for incomparable flatness, parallelism, perpendicularity, surface finish, and hole location across its line of workholding foundations. Every foundation undergoes a rigorous inspection process using AME's in-house coordinate measuring machine (CMM).
If you require repeatable, precise, and trustworthy workholding foundations, it’s time to talk with our experts about what AMROK can provide, in-house and in the U.S.
| Tolerance | Precision |
|---|---|
| Flatness (tombstones & plates) | .0005 / 12x12 |
| Parallelism (plates) | .0005 / 12 Max .002 total |
| Perpendicularity | .0008 / 12 Min .001, Max .002/48 |
| Surface Finish | 63 RMS |
| Face Thickness | ≤18” = ±.002, >18” = ±.003 |
| Tapped Holes (non accumulative) | ±.005 |
| Precision Bushing I.D. | +0.0013 / +0.0007 |
| Precision Bushing Concentricity | 0.0001 |
| Bored or Precision Bushing Hole to Adjacent Hole | ±.0005 |
| First Row Bushing Hole Location from Datums | ±.002 |
| Bored or Precision Bushing Hole Spacing (non accumulative) |
0-10 ±.0005, 10-20 ±.0008, 20-30 ±.0010, 30-40 ±.0012 (for aluminum, add 50% to these tolerances) |
Empower yourself with the resources to make an informed decision and get up and running quickly.
Our team is here to help at every step. If you have questions or need guidance on selecting the right fixture, contact our workholding experts for personalized assistance. We’re happy to provide recommendations or even a custom fixture design review to ensure you get the most out of your investment.
AME provides a handy guide on how to select the right tombstone from their wide range of products.
The Power-Check 2 Drawbar Pull Force Gage from OTT-JAKOB helps keep your machine spindle drawbar force in tolerance. Here’s why that’s so important.
The one component that is common to all workholding systems is a method for clamping the part(s). As we discussed earlier, machining involves forces that can be significantly high, and a clamping system is needed to restrain...
The easiest way to get a quote is by using the "Request Quote" button found on the site. If possible, give a clear definition of the part number and quantity requested. Email and phone requests are also accepted.
We can do both! More than 95% of tombstones are cast iron, but we do cast aluminum, epoxy mineral, and aluminum and steel weldment, depending on the application and its requirements.
Each tombstone and/or design and build fixture is inspected on our CMM’s to verify compliance to specification. Design and build fixtures have an additional approval and validation phase with the customer.
We use SOLIDWORKS 2018 for our designs, SOLIDWORKS CAM for cutting and programming, and Vericut for cutting path verification.
We can use a variety of brands depending on the specific application or customer preference. In addition to integrating our own products, our team utilizes fixturing options from our Build on the Rock (BOTR) partners: 5th Axis, Martin Trunnion, Mitee-Bite, Schunk, Triag, and Vektek.
Yes! We have developed many hydraulic and pneumatic fixtures.
There are many different variables that are considered when choosing a tombstone material. Review our whitepaper on Tombstone Testing for Dynamic Performance compiled by Tony Schmitz, PhD. to learn more about how to choose the best material for your application, including analysis on vibration, damping, and more. Download it here.
