This is a question I had a while back, and I've gathered a lot of information on the subject. It's going to be $30 - $60/hr for design and drafting, and $100 - $150/hr for engineering--assuming you have your own software and licenses.
SOLIDWORKS COSTING WILL HELP YOU TO SOLVE YOUR PROBLEM AS MUCH YOU THINK IT DIFFICULT TO SOLVE YOUR PROBLEMS CALCULATIONS FACED BY MANUALLY.
Thanks and Regards
E G S Computers India Pvt. Ltd.
There are many factors need to be considered before giving rate.
1. Type of Project (Drafting, Design, Modeling, Analysis)
2. Difficulty level of project.
3. Estimate hours for Project Work.
4. Output for Projects. Drawing, Models, E-drawing etc.
5. User Experience.
6. User Expert level.
Do consider Conversion rates and Taxes if job is out of country or in different currency.
As I have seen in USA the Modeling/ Drafting charges range from 15$ to 60$ per hour. and if Design is involved then 60$ to 200$ Per Hour.
There is no standard rates as such. It varies from project to project and Customer to customer. You should keep highest priority on you estimation.