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REQUEST A QUOTE

 

To request a quote, please read the following instructions and download the "Build of Materials" spreadsheet below. Once you have completed the "BOM", submit it to info@imsmfg.ca, along with your contact information and whether the quote is for a consignment, procurement or manufacturing project. Thank you, and we look forward to quoting on your requirements.

 

Downloadable IMS Build of Material Spreadsheet (IMS_BOM_Doc.xls)

 

Consignment


In order for IMS to provide you with an accurate quotation, we require a Bill of Material that consists of customer part number, description, part package, quantity, include top and bottom totals for double sided SMT PCB's and reference designator. We also require a copy of the gerber files, as well as the general panelization information (panel configuration and size). If the circuit board does not have any reference designators on it we will require a drawing with that information. If there are any special requirements like LED’s or resistors that need to be raised off the board or installed at right angles, any hardware that needs to be installed, it should be documented in a drawing, picture or a sample. A sample BOM spreadsheet is attached.

 

 

Procurement


If we are to provide a procurement quote, we will require all of the information outlined above as well as manufacturer and manufacturer’s part number for each item, as well as any approved substitutions. It is also helpful to have an indication as to the ability to substitute parts. A simple 1, 2, 3 method with 1 being “No Sub” 2 being “Sub Upon Approval” and 3 being “Sub At Will” works well. If there are any specialty parts or purchase agreement it can be helpful to our purchasing staff to know that. A sample BOM spreadsheet is attached.

 

 

For Manufacturing

 

  • PCB Design


The board travels on a conveyor and is clamped into position so parts placed close to the edge of the board are a problem. This is not a problem on a panelized set of boards in a frame or border. Boards are clamped in the SMT machine and require a minimum clearance of 4mm from board edge to the edge of the solder pad in order to be placed correctly.

 

In order to run double sided SMT we either glue and wave the parts (less accurate but less expensive if there is a lot of through hole parts) or reflow both sides and hand solder or Selective Wave the through hole parts. Either way it is important to keep one side of the board free of bulky components like Electrolytic/tantalum caps, buzzers, inductors etc. High lead count IC’s are acceptable for reflow/reflow/handsolder but not good for reflow/glue/wave as they tend to bridge badly in the wave. If possible, keep one side free of these components otherwise we will have to hand solder them which is more expensive.

All PCB’s require fiducial marks to ensure accurate placement of parts on the board. The SMT machine uses them to accurately locate the board in the machine and compensate the placement for board location. They are usually three or four small circles of approximately 1-2mm diameter in the copper layer and not covered in solder mask. They should be placed on the corners of the board or panel. It is best not to have them symmetrical to prevent the board from being built if the board is inserted in the wrong orientation.

  • Panelization


Generally the panelization question is more dependant on a few key factors and less dependant on machine capability, the machines will generally build a panel much wider than we would be comfortable running.

1. How many heat cycles is the panel going to see? Each time the panel goes through reflow/wave solder the panel will sag from the heat and the weight. If the panel is double sided SMT and waved you need to keep the panels fairly small to avoid warping or build a carrier to support it.

2. What is the Run Time in SMT? The goal of panelization is to have enough placements to keep the machines running without having to wait for printers and ovens. Our lines run at about 15K and 25K placements/hour. If we can have the panel in the machine for 1-4 minutes that keeps the machines running and the operators working at a reasonable pace.

It is more important to have the boards remain flat than to have the lines run at peak efficiency so if there is a conflict between 1 and 2 above, 1 takes precedent.

Consult IMS for advice on panelization.

  • Stencil


In order to make the stencils we require a paste layer for each side of the board. This is a layer in the gerber that indicates all of the surface mount pads that need to be cut in a stencil. Normally the part in the layout software defines the pads and the pad layer can be printed with the gerbers. Most part manufacturers will provide a preferred pad and paste file that should be used when creating the part information in the layout software. We do not check to ensure that every pad is in the paste file. It is the customer’s responsibility to make sure that all the SMT parts have the appropriate pads in the paste layer. If an error is made and the paste layer was not accurate, IMS will not be responsible for purchasing a new stencil. For panelized boards we require a set of panelized gerber files to ensure that the board spacing is accurate. The board supplier can provide this information.

  • Data


We also require the X-Y data in either text or excel format, as well as PCB CAD data for your board. This is the center location of all of the SMT placements with reference designator, X/Y coordinate, rotation Top/Bottom indication, and part number. We use this data to program the machines to place the part accurately. This information can also be generated from the layout software. A sample is provided. It is easiest if the board origin is located at one of the board corners, on odd shaped boards or on boards where the origin is located elsewhere, a drawing indicating the origin is helpful.