General > General Technical Chat

Crimpers for automotive

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nctnico:

--- Quote from: Siwastaja on March 08, 2024, 07:11:49 pm ---
--- Quote from: nctnico on March 08, 2024, 12:24:22 am ---Crimping is a cold-flow process and a non-ratcheting crimper simply can't develop the pressure on the jaws needed to take the metal beyond the point where it starts to flow.

--- End quote ---

You are mixing two orthogonal things up. While ratcheting is an excellent feature because it prevents losing the force mid-way and forces the user to push till the end (which is usually adjustable) to release, it has nothing to do with the force per se; force comes just from the lever action so placement of the pivot point relative to the die, length of the handles; design of the handles is also important because if it is uncomfortable to press, then users are less likely to use enough force. But even for a non-ratcheting design, if those force-related details are well engineered then it's really fine.

--- End quote ---
The latter is the problem. It is not well engineered. The relatively thin ends of a tool like the 'engineer' pliers are way too flexible to produce the required pressure. If you can squeeze that hard (which is unlikely). A ratcheted crimper produces way more force on the crimp for the same input due to how the mechanism works to amplify the force from the handles to the die. So no, I'm not mixing anything up. Just take a ratcheting crimper and notice how the amount of travel of the jaws is reduced for each 'click' the jaws close further but the travel distance for the handle stays more or less constant. There is also a typical difference between the cheap Chinese crimpers and the professional ones. The professional ones typically have a much more sturdy construction (more steel plates in parallel or thick solid steel) compared to the cheap crimpers.

tooki:

--- Quote from: nctnico on March 08, 2024, 03:10:04 pm ---
--- Quote from: notsob on March 08, 2024, 02:20:27 am ---As a guideline, have a look at what Rhintoools in Australia sell - you should be able to find similar near you

https://rhinotools.com.au/product-category/crimping-tools/automotive-crimping-tools/

--- End quote ---
As expected you can buy the exact same crimpers for less from Aliexpress. Search for Cinlin or Iwiss crimpers.

--- End quote ---
Without seeing them up close and testing them, we cannot say whether those are the "exact same" tools or not. Iwiss and co slavishly copy others' tool designs, so the fact that they look the same doesn't mean they are the same. And as you surely know, in crimping, where success and failure comes down to tiny fractions of a millimeter, a glancing (or even close!) similarity simply doesn't mean anything.

tooki:

--- Quote from: DoctorJelly on March 08, 2024, 04:51:30 pm ---Appreciate you all! Busy season starting up and I was getting frustrated trying to find a master kit. With everybody's help I think I can piece together a kit that suits my needs. Would be nice if the dies were machined instead of MIM, but beggars can't be choosers!

--- End quote ---
I highly suggest trying to get used or surplus original tools instead of no-name stuff. Cheap crimpers suck. If you'll be using this for your own pet projects, you may be willing to live with the risk of poor crimps coming apart. But if it's for customer work, invest in the real tools. Your customers, and your reputation, will appreciate it. Note also that original tools are generally easier to use (because they have locators to hold the terminals for you), which saves a lot of time (and thus money) and reduces errors.

nctnico:

--- Quote from: tooki on March 08, 2024, 08:41:05 pm ---
--- Quote from: nctnico on March 08, 2024, 03:10:04 pm ---
--- Quote from: notsob on March 08, 2024, 02:20:27 am ---As a guideline, have a look at what Rhintoools in Australia sell - you should be able to find similar near you

https://rhinotools.com.au/product-category/crimping-tools/automotive-crimping-tools/

--- End quote ---
As expected you can buy the exact same crimpers for less from Aliexpress. Search for Cinlin or Iwiss crimpers.

--- End quote ---
Without seeing them up close and testing them, we cannot say whether those are the "exact same" tools or not. Iwiss and co slavishly copy others' tool designs, so the fact that they look the same doesn't mean they are the same. And as you surely know, in crimping, where success and failure comes down to tiny fractions of a millimeter, a glancing (or even close!) similarity simply doesn't mean anything.

--- End quote ---
I'm 100% sure. AUD150 (90 euro) doesn't buy you professional or quality crimping tools. Only Chinese rebadges with a big markup.

Even with brand names you have to be careful. For example, nowadays Gedore which is regarded as a high quality brand for tools, has a made-in-Asia economy line called Gedore Red.

tooki:
Even at that price point there are differences in quality. That’s true even at the $15 AliExpress price point. There are numerous manufacturers of Chinese junk tools, of varying quality.

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