ISO 8015 · ASME Y14.5 · PRACTICAL STANDARDS
Standards-Compliant & Cost-Effective Component Tolerancing per ISO GPS
Reduce development cycles, costly scrap, and interpretation gaps between design, manufacturing, and quality control through practical ISO-GPS expertise.
25+ YearsIndustrial practice
SteinbeisCertified expert
STEP-BY-STEP PROGRESSION
Your Path to Field-Tested Tolerancing
From free introductory examples to CAD guides and enterprise partner support
STAGE 1: ENTRY
Free Introductory Example
Free Example (0 €)
Test our system risk-free: Download the complete practical example “Cover” including 3D view and PDF guide for free.
STAGE 2: INDIVIDUAL
Practical Case Studies
Field-Tested Components & CAD Guides
Select specific component guides from our library (flanges, shafts, housings) for immediate application in your team.
STAGE 3: EXPERT HUB
B2B Executive Partner
Full Access + AI MCP Connector
Unlimited access for engineering teams: Full access to all practical examples, monthly MS Teams live calls, transcript search & AI MCP Connector.
✓ In-house licenses for teams
✓ Direct line to Marcus Grella
Popular practical examples at a glance
Discover real components with precise CAD drawings & 3D examples
Base Plate Measuring Fixture
34 €
Complex dimensioning & datum systems for high-precision inspection fixtures.
Bearing Plate
29 €
Form & position tolerances to avoid assembly conflicts.
Sheet Metal Bent Part
28 €
Standards-compliant dimensioning of bent freeform surfaces & developments.
Marcus Grella
Founder & ISO-GPS Expert
ABOUT MARCUS GRELLA & STEINBEIS
The hard facts behind ISO GPS Practice
As a trained toolmaker (1998), mechanical engineering technician, and former design manager, I combine solid craft manufacturing knowledge with years of leadership experience in component development and metrology.
- Trained toolmaker: 25+ years of industrial experience in mechanical engineering & mold making.
- Steinbeis Expert: Head of Steinbeis Consulting Center Design. Materials. Standards.
- Standards specialist: Geometric specification & verification per ISO 8015 and ASME Y14.5.
- Developer of all practical examples: Lossless transfer of standards-compliant component tolerancing.
VIDEO INTRODUCTION
How GPS-PRACTICE.COM supports your development process
Learn in this video how clear specification forms the basis for effective collaboration between design, manufacturing and quality assurance.
Read full video transcript
Every technical solution begins with an idea, a thought, a sketch, a product that eventually has to work. Between the idea and the finished product lies a complex process. If the basis for the value chain is not clearly formulated, design, manufacturing, and inspection cannot truly work together.
The consequence: non-functional components, contradictory measurement results, rising costs due to rework and scrap, conflicts between contracting parties, and misunderstandings between manufacturing and quality.
This is exactly where we come in: we offer training and consulting focused not on textbook theory, but on your real products and engineering challenges using practical ISO-GPS rules (ISO 8015 & ASME Y14.5).
Knowledge & News
Latest from the ISO-GPS World
Standards updates, practical tips & industry developments
Examination Standards
December 1, 2025
ISO-GPS Examination Standards: Are We Ready for 2026?
Starting in 2026, ISO GPS becomes officially relevant for examinations in metalworking professions!
Standards Update
August 12, 2025
The New ISO 14405-1:2025 Is Here – ISO-GPS Update!
Revision of the key standard for dimensional tolerancing of linear sizes.
Frequently Asked Questions
Frequently Asked Questions (FAQ)
Answers to all key questions regarding licenses, ordering, training & company guidelines
Are there any other payment methods?
Yes. From an order value of 200 €, you can conveniently pay by invoice via bank transfer. Please contact us at info@gps-practice.com or use our contact form.
How can the “GPS-PRACTICE Expert Hub” be booked for my team?
The Expert Hub is offered on B2B request with a minimum term of 6 months. Billing is conveniently via company offer and purchase on account (incl. SAP/PO number). After commissioning, we manually activate your team’s company accounts.
How do enterprise licenses work?
The billing address creates an account using a company email address (e.g. Procurement). Once the team email addresses are submitted via our contact form, user accounts are activated for your team.
The enterprise license is usable without restrictions within your organization (e.g. internal intranet), but external distribution is not permitted.
Are practical examples to be understood as training?
No! Our platform is intended to help you understand how to apply the tools of geometric tolerancing on real-world examples correctly. Thus, these examples are not to be understood as formal training courses.
Certified in-house trainings and consulting can be booked directly via https://www.gre-tec.de/ or https://www.toleranzen-beratung.de/.
Do I receive additional support to the Step-by-Step Guide?
Individual support for your own product drawings is not included in single purchases. If you need further support for your own products, please contact https://www.gre-tec.de/.
If you discover an error or typo in a guide, we appreciate your feedback via our contact form and will correct it immediately.
Is there also a subscription solution?
Yes! For corporate teams, we offer full flat-rate access via the GPS-PRACTICE Expert Hub. For individual users, single practical examples can be purchased flexibly in our shop.
Can I cancel the purchase by returning the product?
No, as digital download products, these items are excluded from return once delivered.
How can I send an inquiry regarding component examples or questions?
Simply send us a message via our Contact Form for general inquiries. Please ensure that drawings or component descriptions are anonymized without title blocks.
After reviewing your request, our team will get back to you promptly.
Can educational institutions use ISO GPS examples for teaching?
If you would like to use our practical examples in your educational courseware or examinations, please reach out via our contact form to arrange an educational license.
Can we have custom practical examples developed for internal company guidelines?
In this case, please contact https://www.gre-tec.de/ or write to us via our contact form. We are happy to develop custom practical examples specifically tailored to your company requirements.