Why has the delivery time for CNC processing in Shenzhen changed 7 days to 15 days?

Those who do robot research development have had this experience: when the drawings are sent, the processing factory says it will be delivered within 7 days. On the 7th day, I asked it was said that the production schedule was still in progress; On the 10th day, it was asked that the dimensions were up to standard had to be reworked; Received the parts on the 15th day. The project nodes are all in chaos. Why is the delivery time of Shenzhen CNC processing always delayed? It's that the processing plant intentionally slows down, it's just that a few links are stacked together, which prolongs the time.

The first reason is queuing for production

Many CNC processing plants only have a few machines take orders more than ten customers at the same time. Your parts are ranked behind others. The previous complex order took 5 days to complete, so yours will take 5 days to complete. How to judge? When sending the picture, directly ask: Which device is our item on? When can I get on the computer? If you can't answer, there is no guarantee of delivery time.

The second reason is that the first piece is qualified needs to be reworked to start over

This is the most common cause of delay. I made the first part on the machine found that the dimensions were incorrect - the tool was worn, the clamping was off center, there was a problem with the program. Rework machine adjustment will take another day two. If there is no first article inspection system batch production is carried out directly, it is only discovered that something is wrong after completing all the tests, then rework will take a whole batch of time. A legitimate aluminum alloy precision machining factory will first make the first piece, conduct a three-dimensional full-size inspection to confirm that there are no problems, then proceed with mass production. Spending half a day on the first piece saves a week of rework for the entire batch later.

Third reason: Outsourcing of surface treatment

After CNC machining of the parts, anodizing, sandblasting, powder coating are required. Many of these surface treatments are outsourced to partner factories. Outsourcing requires queuing up, it takes 3-5 days for the oxidation plant to queue up. Encountering color difference unqualified re spraying, it's been another week. How to prevent it? When sending pictures, ask clearly: do you do the surface treatment yourself outsource it? How many days does it take to send it out? Can it be arranged synchronously with the processing?

The fourth reason is that the drawings are constantly changing

This is on the processing plant, but it is indeed the main cause of the delivery delay. Half of the drawings have been revised in size, holes have been added, materials have been changed. The processing plant is currently working on it, but has stopped production upon receiving the new version of the drawings. The old version of the work in progress is scrapped production is being rescheduled. Time time again, it's been a week. We have seen too many cases of CNC machining of aluminum alloys. It is recommended to review the drawings internally before sending them out, confirm that there are no issues before sending them out. If you really need to make changes in the middle, go through a change order clean up the old version materials before making a new version.

How to avoid repeated delays in delivery time

When asked about these four incident pictures, the delivery time can be basically controlled.

Delivery time of Shenzhen Huiwen Zhizao

We do CNC processing in Shenzhen, the sampling usually takes 7-15 days. The quotation cycle is 1-3 working days. Why do we say 7-15 days instead of 7 days of death? Because the complexity of the parts varies - simple parts can be produced in 7 days, while complex multi-faceted parts require five axis three coordinate testing, with 15 days being the normal range. When we quote, we will clearly state the delivery time, instead of saying 7 days, we will make it 15 days. We outsource the surface treatment to the oxidation factory we have been cooperating with for many years. After processing, we send it over first, then inspect it again after oxidation. If there is a problem in the middle, we will coordinate internally there is no need for customers to rush back forth.

Frequently Asked Questions

Q: How many days can the sample be produced at the earliest? Simple parts take 3-5 days, complex parts take 7-15 days. Look at the structure of the parts send pictures for evaluation.

Q: Can the delivery time be expedited? Yes, but there is a premium for urgent orders. Specifically, it depends on the complexity of the parts the production schedule.

Q: What if the product is up to standard? Batch production will only be carried out if there are no issues with the first article inspection. If there is really a problem, there will be no extra charge for rework production will be rescheduled.

The delay in Shenzhen CNC processing delivery is due to three reasons: the first piece was completed, the surface treatment was sent out in a queue, the drawings were changed midway. Asking these things clearly before sending pictures is more effective than anything else. Welcome to provide drawing consultation. We can provide 2D drawings, 3D models, technical requirements to obtain DFM process evaluation itemized quotations.