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placements per hour

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jobbie

#39737

placements per hour | 16 February, 2006

Hi everyone, New to the forum and have a question. How many cph are others getting? We are small sub-contract firm and are running Mydata my12 with hydra, but not agilis feeders. We tend to do small batches (upto 100 circuits), high mix from 0402 to 40mm bgas.

According to our management data we are averaging 500 cph on an 8 hour day - this has included some "quite" periods. It is our setup times which is costing machine runtime,quite often our setup will be double the run time.

Any info,advice would be appreciatetd.

Rgds

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Mity-C

#39738

placements per hour | 16 February, 2006

Good Morning jobbie,

We have several Mydata lines. We are building low volume high mix as well. Our CPH had been identified as approximately 6000-8000 CPH depending on the application of course. We do have a separate setup area however that stages a job, loads the component to opimized setup lists, pulls the stencils, boards and serializes the boards. They are staged on rolling carts. Basically, when the job is rolled down to SMT, it has all required component to run. We have a team of three operators who all converge to setup the machine (load feeders, trays, layout and lable hand placements, etc...) We have averaged about 15 minutes to setup a machine for first piece assembly.

This has doubled our CPH from previous methods. The downside of this is that you do need an arsenal of feeder boxes. We are also using the Agilis feeders as well.

Hope this helps

Chris

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JAX

#39747

placements per hour | 16 February, 2006

It sounds like you are getting CPH numbers without taking into acount Machine utilization and efficiency. By doing that you can overlook what the real problems are.

First find your utilization numbers... available machine run time with respect to the total time. ( full work day )

Next find your efficiency numbers... actual machine run time with respect to the available. ( see utilization )

By breaking everything out you should be able to find and correct what is going wrong... or justify the changes needed to reach your desired goals.

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jobbie

#39751

placements per hour | 16 February, 2006

Hi jax

Have checked actual assemby time against machine up time and have a figure of 5440cph which seems to be ok from what others are saying. Its just the utilization that i need to sort but this is difficult with the resources/restrictions that i have.

We do try to preload jobs but we only have 10 x 8mm magazines and 2 of each 12mm and 16mm. We also have 4 vibs but these are more aggravation that it is worth. We were able to make some of our own waffle trays which takes the strain a bit, for so8 etc.

Thanks to all for the help

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Mity-C

#39783

placements per hour | 17 February, 2006

Jobbie,

We are also not using the Mydata forks for the vibe feeders. We take a tube for the vibe component and cut a pick pocket. We use the back of the forks as stops. This has eliminated many of the pick problems from the vibes.

Good Luck

Chris

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#39789

placements per hour | 17 February, 2006

Hi,

One think we always hated when running MYDATA was the vib feeder, and we had no end of problems. The supplier told us most people angled the component tubes up, however then the vib settings change between when the tubes full, and mostly empty. It means the machines always stopping, and production is stalled and overall very slow.

We solved it mostly by putting all the tubes flat, and we did use the tube forks, but we also had a long think pice of card that we kept in each tube as a back feeder, and it helped transfer more of the vib energy into the components so they would feed all the way. It was a good trick and helped keep all the tubes feeding to the end.

The cards sometimes come in the tubes when they are not delivered full, and they must be to stop the components sliding up and down the tube in transit. It's worth trying.

I found that most of the issues in production speed with a MYDATA come from the machine stopping all the time with various problems. The vision system is crap as well, but the vib feeder is a problem because not only is it not a reliable design, but tube sticks have so few component with only 50 or 100, that if you have a bunch of sticks of different components, your always refilling one, and the machines stopped.

So the best thing is to do things that actually keep the machine running more often, even if you need to slow some things down, such as extending the vibration time on the vib feeder. The more consistent the run, the more throughput.

Regards,

Grant

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#39835

placements per hour | 21 February, 2006

To everyone who hates vibe feeders, Follow this link--http://www.contactsystems.com/C5.htm Scroll down and click on the video clip that says stick feeders. Yes, I work for Contact System--but this is such a great solution for tube parts. I consider it one of the industries best kept secrets. For low to mid volume manufacturing (and even high volume) the tube fed parts are often overlooked during equipment evaluation almost as if everyone reluctantly accepts vibe feeders as a part of life. There is an alternative.

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FD

#39846

placements per hour | 21 February, 2006

Are those stick feeders made from Component Express?

They look and operate very similar to their feeders.

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#40065

placements per hour | 28 February, 2006

As far as I recall the Component Express is a copy of a prototype we showed around trade shows about 5 or 6 years ago. In the case of the Component Exress feeder basically you stick an air tube in the back of a stick. It is in no way comparable to the air track system. Think of a pea shooter versus a magazine clip for an AK-47. The guy is still in bussiness though so maybe they are cheap solutions for low volume applications. Regards--

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