GoKimco

Tools & Supplies for Electronic Repair and Assembly

  • Eclipsing our prices, one day only take 7.5% Off EVERYTHING !

    To celebrate the 2017 solar eclipse, we are offering 7.5% off everything we sell at GoKimco.com

    Just use coupon code ECLIPSE at checkout.

    This is a perfect chance to stock up on solder, tools, soldering supplies, labels, ESD supplies, and more!

    Sale ends August 21st at Midnight...

    Sorry - this sale is dead, but use KIMCO5 to save 5% on everything.

    SHOP NOW!

  • Dr. Storage Dry Cabinets

    Dr. Storage, founded in 1991, manufactures dry storage cabinets utilized by major technology companies such as Apple, Sony, Panasonic, and IBM. Dry storage cabinets. These cabinets meet  J-STD-033C standards and are necessary for safe manufacturing, service, and storage of sensitive electronic parts. Humidity control is vital to avoid incomplete soldering connections and cracking of epoxies used on printed circuit boards and other delicate electronic components.
    f1-1200
    Dr. Storage offers customize-able cabinets in a variety of sizes that can be configured to meet your humidity control needs.
    Features and options include:
    • LED controls with temperature and humidity indicators
    • Storage bins
    • Airtight cabinet body with reinforced glass windows
    • Dehumidifier made of PPS material (no dripping or frosting)
    • Adjustable shelves
    • Tape feeder and tape reel add-ons
    • Customize-able slide drawers with optional dividers

    Until December 31st 2016, GoKimco.com is offering free freight on all Dr. Storage dry cabinets. This is a great opportunity to outfit and upgrade your production facility. Give us a call if you need help deciding which options are best for your needs! (800) 521-9197

  • Vision Engineering End of the Year Promotion

    OFFER 1

    FREE Smart Cam with every Lynx EVO system – a $1,910 value

    Take your inspection results to the next level with the Lynx EVO and get the Smart Calynx-evom HD digital camera and software for FREE!

    Smart CAM (EVC130) offers easy convenient image/video capture while retaining both optical paths for stereo viewing.

    • Stunning 3D (stereo) optical imaging.
    • Quickly and simply capture HD images or video.
    • Add annotation / mark-up captured images with included PC software.

    Quote AP16 with your order

    Terms and Conditions: A Lynx EVO system comprises of a head, zoom, stand, objective and ring light or 360 degree rotating viewer. Promotion runs from 11/1/2016 to 12/22/2016, orders must be placed by 12/22/2016. Distributor orders to be drop shipped. Not to be combined with any other offer. Offer available while stocks last.

     


    OFFER 2

    ½ Price 360o Rotation Viewer with Lynx EVO or EVO Cam system purchase- $1,935* savings

    Enhance your inspection with the 360o rotating viewer, at 50% off.
    The rotating viewer for the Lynx EVO and EVO Cam delivers an oblique view of the subject that can be rotated 360° degrees around a central point, making it ideal for working with evo-cam_-2 evo-camengineered, electronic, or precision parts – the fastest, simplest way to inspect all the way around a component without holding it.

    • Easy to switch between rotation view and conventional direct view.
    • View all around a component, quickly and accurately.
    • Ideal for electronics inspection (PCB solder joints, holes, pillars and thread forms), mechanical, medical and plastics components and more…
    Terms and Conditions: A Lynx EVO system comprises of a head, zoom, stand, objective and ring light. An EVO Cam system comprises of camera, stand, objective and ring light. Promotion runs from 11/1/2016 to 12/22/2016, orders must be placed by 12/22/2016. Distributor orders to be drop shipped. Not to be combined with any other offer. Offer available while stocks l

    *savings based on EVO Cam 360o viewer RRP.
    Quote AP16 with your order

  • Is Water Harmful to Electronic Components?

    hose-spraying-waterMany experts in the electronics assembly world will cringe when they hear about a manufacturer hand-washing their boards with soap and (gasp!) water. The first point to bring up here is that boards should never need to be washed. This is a clear indication that you are somehow bringing dirt into the process, whether through alcohol, brushes, or something else the boards are coming in contact with.

    Know Your Water Grade

    There are three grades of water that you can use to clean the boards; tap water, distilled water, and deionized (DI) water. For this type of precision cleaning you should never use tap or distilled water, which themselves contain contaminants that can affect your boards. If you must clean your boards with water, the only choice is deionized water.

    Deionized water is measured by the water’s resistance to electric current. 50kOHM is standard and can be purchased easily and at a relatively low cost. 1 megaohm is really the minimum required for this type of precision cleaning. In high-precision manufacturing, such as semiconductors, 20 megaohms is the industry standard. Obviously cost and availability are both big factors. As you increase the pureness of your water, it also becomes more difficult to handle.

    One option is a sealed, closed-loop system which purifies the water, performs the cleaning task, and then recycles the water. However, this type of system is costly and can result in a slow through-put. Given these restrictions when using water in the cleaning process, more and more manufacturers are switching to cleaning with solvents. The ideal solvent is strong enough to remove the contamination, while still mild enough to not damage any components on the board.

    GoKimco has a complete line of solvents, ideal for finding this healthy balance for cleaning your boards.

  • Gauging Solder Paste Volume

    stencil-printingKnowing just how much solder paste to dispense onto a stencil for a production run can often seem like a guessing game. The ultimate goal is for the paste to completely fill the aperture and release onto the board with 95% transfer efficiency. If the board is not sitting flush again the stencil, then you may see a greater than 100% transfer efficiency. This can lead to a final paste height that is higher than anticipated. Too little solder paste, and you risk not covering the board entirely, leading to an array of problems.

    The amount of paste that you dispense onto the stencil will vary depending on the size of your production run. For a smaller number of boards, ten or under, a minimal amount of paste will be needed to achieve the smooth, rolling action that you need. For larger production cycles, you will want to apply the maximum amount of solder paste possible without loading the squeegee too high, creating flooding and spilling over the sides. A good rule of thumb is 0.75” diameter down the length of the squeegee as a minimum and a 1.5” diameter as a maximum.

    Operators should always be watching for paste leaking out of the sides of the squeegee, which can result in skip defects. Paste remaining idle during the printing process can dry out and harden faster. To prevent this, operators should be trained to open the printer regularly, every 30 minutes is a good rule of thumb, and reposition the paste to the middle of the squeegee.

    It is good practice to print one dummy board before each production run. This first run often uses an excessive amount of flux and can pick up any dust or contamination that can then be loaded into the apertures of the board. Running this test board also ensures that the paste is rolling and that the squeegee is set up properly, with no streaks left behind.

    Using a quality solder paste paired with the right squeegee can make a big different in your product run.

    GoKimco has a complete line of solder paste and quality squeegees to ensure that your production process runs as smoothly as possible.

  • Meet our team: Nate Lelle - Customer Service Wizard and Paintball Champion

    Nate Lelle is the customer service wizard here at Kimco, but you might not know that he is also a nationally ranked paintball player, and member of the renowned Cleveland Imperial semi-pro paintball team. Kimco is proud to sponsor Nate and the Cleveland Imperial team, which has had many top finishes at top level events all over the country. Nate brings the same passion he shares for paintball to his work providing you the best customer service Kimco has to offer.

    Check out Cleveland Imperial here:

  • Epoxy Bonding Problems on RoHS Boards

    epoxy bonding rohsIf you have seen problems with epoxy bonding components to RoHS circuit boards, you are not alone. This may be related to the surface energy of the board. Generally high surface energy is a good thing, while low surface energy is detrimental. The surface energy of the solder resist varies with the many types available. Oven curing the solder resist tends to lower the surface energy because the silicones are then forced to the surface during the curing process.

    It may be useful to perform a simple control test to investigate the surface energy of the boards. This can be done using dyne pens or a contact angle test. If you are using a dyne pen, 36 to 38 dynes is average. A no-clean, assembled board would be about 32 dynes, and you would not want to work with anything lower than this.

    To perform the contact angle test, measure the contact angle of a droplet to see how much the droplet beads up or wets out onto the surface. If when you perform the droplet test you find that the beads are quite round and do not wet this indicates low surface energy and poor bondability.

    From here you should conduct a suitable gas plasma treatment on some of the boards and see if this improves bondability and adhesion. You can bond actual parts to both the control and plasma treated boards to confirm any improvement in adhesion.

    If you are bonding to a metal surface, you should always first prep the surface with etch or alcohol. This will ensure the area is clean prior to any epoxy applications. GoKimco offers a complete lining of cleaning wipes to prep the area. Visit

    To find the best epoxy solution for your application shop GoKimco.

  • Surface Texture on Solder Joints after Reflow

    surface defects reflowSeeing surface effects when using lead-free solder is not an unusual occurrence. There are many factors that could be causing texture on the solder joints after reflow.

    The following are several of the more common factors that could be contributing to this defect:

    • Thermal profile used, peak temperature and cool down rate
    • Metal finishes on the parts that were soldered, dissolution occurs which can impact color
    • Reflow atmosphere
    • Physical or chemical properties of the flux, some fluxes react more with the solder surface than others
    • Flow properties of the flux during the reflow process, some fluxes flow more rapidly than others, giving extended exposure to oxygen
    • Excessive oxidation of the parts to be soldered
    • Shelf life of the paste or how the paste was handled prior to use

    Keep in mind that while the surface of the board may look frosty, discolored, or be demonstrating shrinkage effects this does not necessarily point to a reliability issue. Instead the solder joint may remain in excellent working condition with adequate intermetallic bonding.

    If you suspect that there may be a reliability issue associated with the appearance you will need to do some pull/shear testing to examine the bond layers. Use a quality pair of shears for the most accurate results. (http://gokimco.com/search?form_key=ViRkrOmJrsyABtEG&q=shear) If there is a problem with the bond layers, examining the reflow process for problems and / or changing to a different solder paste can correct the problem.

    GoKimco has a wide variety of solder pastes so that you are sure to find one that will sort out this issue. Visit http://gokimco.com/solder-flux-mask/solder-paste.html.

  • Why Would You Have to Clean a No-Clean Soldering Flux?

    no clean flux residueIt sounds like an oxy-moron but it is a common misconception that no-clean flux never needs to be cleaned. Many in the industry have experienced the conductive residue that can be left behind by no-clean flux. This residue can be extremely hard to remove, which becomes a big problem if you are working with sensitive boards. Because the no-clean fluxes are designed to not need to be cleaned they do not come off easily, which can be problematic.

    The amount of residue that is left on the board is dependent on several factors including the amount of solids-resins, gelling agents and activators contained in the flux. There is less flux residue left on the boards when the solids content is lower. Most of today’s no-clean flux contain between 50 and 70 percent solids.

    Despite all of this, no-clean remains the most widely used type of flux. Manufacturers are in the habit of running all of their boards with no-clean, and simply cleaning only those boards that require it.

    It may be tempting to not clean your dirty boards, simply because you are using a “no-clean” flux but this can have significant adverse effects down the road. In the past, assemblers saw problems arise with in-circuit testing on these un-cleaned boards. The residues from these no-clean fluxes also lead to malfunctions in circuits with clock speeds.

    acl staticideWhile in most cases not every board being soldered with no-clean flux will need this extra step, you do need to be on the lookout for the tell-tale residue left behind and clean these boards to prevent problems down the road. One great product for doing this is ACL Staticide 8623-12 No Clean Precision Flux Remover. This product can be purchased online at KIMCO Distribution http://gokimco.com/search?form_key=OhbYqHgT3MbeEp53&q=ACL+Staticide+8623-12+No+Clean+Precision+Flux+Remover.

  • Why Isn’t My Soldering Iron Tip Tinning?

    weller soldering ironOne of the frustrations in the electronics assembly world can be when your soldering iron tip cannot be tinned. Tinning is a necessary step for all new tips. By tinning the soldering iron tip, you can keep the tip from oxidizing. The fine coating of solder that is applied to the tip is critical to the soldering process, as the tip transfers the heat from the iron to the joint that you are trying to solder.

    The real secret to tinning your soldering iron tip lies in the timing. You need to get the coating of solder on the tip before it gets hot and begins oxidizing, which can make this process a challenging if not impossible one. To prevent this oxidation you need to act quickly and efficiently applying the solder.

    Your soldering iron tip also may not be tinning if there is an oxide layer. In this case you will need to first clean this oxidation off of the tip before the tinning process.

    Another sign that there is a problem and that you will not be able to tin the soldering iron is if the tip keeps turning black when you try to solder. Less expensive soldering irons will have a tip that is more likely to get black carbon on it, contaminating your tip with this in turn. If this is a reoccurring problem, it may be worthwhile to invest in a higher-end soldering iron which will save on productivity, not to mention operator frustration, in the long-run.

    Weller is a popular manufacturer of soldering irons that can help to eliminate this problem. The Weller TCP12P Controlled-Output Field Soldering Iron is a great choice.

    KIMCO Distributing offers a wide range of soldering irons, including those from Weller. Visit http://gokimco.com/search?form_key=OhbYqHgT3MbeEp53&q=soldering+iron to browse the soldering irons available.

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