Here's the GF3 glass supplier (Saint-Gobain Sekurit (Shanghai) Co) interview:
Production milestone for Tesla in Lingang
Saint-Gobain Sekurit (Shanghai) Co plays a supporting role for Tesla.
It has built a glass factory in Lingang to produce front and rear windshields and glass roofs for the Model 3. “Mass production is anticipated from October 14, together with the output of Model 3 vehicles,” said Ma Jun, head of the company’s Lingang factory.
“Our annual output is expected to reach 120 million yuan (US$17 million), and at the next stage we may increase our investment and produce for the Model Y,” Ma added.
The 3000 sets of glass information is from this Chinese news article:
特斯拉上海工厂玻璃供应商:玻璃厂正紧张调试,10月中量产_10%公司_澎湃新闻-The Paper
'“We will be mass production on October 14th, the factory is under intense commissioning, and
the first glass will be produced on October 10.” Ma Jun, general manager of Saint-Gobain Safety Glass China Service Center, said that the company’s first phase is currently The product will be used in Tesla's Model 3 model and may be available for Model Y in the future.'
...
'According to reports, the company has provided Tesla with 20 sets of glass products for trial production of the products in August this year.
A total of 3,000 sets will be delivered this year.'
'Shao Zhiyuan, project manager of Saint-Gobain Safety Glass, responsible for the Tesla project, told the journalist that according to Tesla’s previous request,
the company’s monthly output can reach 15,000 sets. “Our capacity design is based entirely on Tesla requests to come."'
A new glass factory will not ramp up instantly either - just like a new car factory. Also note the capacity limit: 180,000 units per year - which is 3,500/week, not 3,000/week. So about +15% more room to grow beyond initial GF3 guidance.
Note that the October 14 start of production news was effectively confirmed by Tesla China by yesterday's announcement to stop taking new SR+ orders after October 14.
While I think Tesla might ship entire battery packs from GF1 to GF3 in Q4 and Q1, I don't think it's overly practical to ship thousands of fragile and dangerous to handle sets of glass over the ocean.
See above, the glass supplier specified 3,000 sets of glass in Q4, so I think they'll start the ramp slowly. I don't think 500/week across Q4 is realistic - they'll start in the middle of October, losing two weeks from the quarter already.
They might be able to reach something like a 500 units burst week by the end of Q4. The real scaling will be in Q1 I believe.