Overall thickness tolerance is +/- 10% Minimum finished thickness for 2-layer: 0.010” Minimum finished thickness for 4-layers: 0.031” Minimum finished thickness for 6-layers: 0.040” Minimum finished thickness for 8-layers: 0.047” Minimum finished thickness for 10-layers: 0.062”

If appropriate concentration levels of coolant are not maintained, several issues can occur. The most common problem is low concentration. If the concentration of coolant is below the machine coolant supplier’s minimum ratio, there is a risk of:

By selecting the right coolant for the type of machine and metals being machined, and by maintaining the concentration levels, you extend the life of the coolant, the tools, and your machine.

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Your design can have both plated and non-plated internal cutouts. We suggest that you add one layer for each type of cutout (plated or non-plated). Just place elements in these layers that are the exact shape of the cutout that you want. For example, if you want a 0.050" x 1.00" slot cutout of the board, then just add a trace of this size to the appropriate layer. If you have a more complex shape, then just submit it as one or more polygons that describe the edge of the cutout. We suggest you draw the polygon with an "F-Type" shape (a line of zero width). If you choose, you can draw the polygons with any width trace. We assume that the centerline of the trace describes the edge of your internal cutout. Plated cutouts will have the inside of the cutout plated with the finish that you choose (Tin/Lead HASL or ENIG (Immersion Gold)). Non-plated cutouts will not have any plating on the internal edges. Name your plated cutouts layer "PlatedInternalRouts". Name your non-plated internal routs "NonPlatedInternalRouts". If you wish, you can also supply a drawing that details the internal cutouts and we will create the needed geometry for you.

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At the start of each day, the coolant should be checked to maintain an acceptable concentration level. Hand refractometers are a great way to check cutting and grinding fluid concentrations to maintain daily control of concentration levels. Machine coolant concentrations can change 5% to 20% every day from evaporation, splashing, misting, and dragout. Keeping a daily log of concentration levels for each machine provides an understanding of how the system is functioning and how much concentration levels change from day-to-day.

This is the expansion of mask relief over pad area. Our minimum is 0.005” over pad dimension or 0.0025” each side. PCB Unlimited will modify files to meet the minimum dimension.

Synthetic Fluids: These types of fluids tend to be the cleanest of all cutting fluids because they contain no mineral oil and reject tramp oil. However, they provide the least lubrication.

CNC machineCoolantPrice

When manufacturing your prototype circuit boards, there may be a small misregistration between the solder mask layers and the underlying copper layers. As a result, we recommend that you swell your solder mask layer so that it is 0.005" (0.0025" on a side) larger than the underlying copper elements. This way, if there is a misregistration, then your copper pads will not have any solder mask on them. You should also ensure that your design has a "Minimum Web" of at least 0.003" between adjacent pads. Smart DFM can pinpoint any problem areas for you.

The type of machining and materials machined determine the type of coolant to use as well as what the balance of cooling and lubrication is needed. By altering the mixing ratio or concentration of the coolant, you get a different balance of cooling and lubrication. A leaner mix provides you better cooling while a more concentrated blend gives you more lubrication.

The minimum annular ring on vias is 0.006" (6 mils) each side of the hole. The pad must be large enough to tent over the hole otherwise you may lose the metal in the hole during outer layer etching resulting in plating voids.

Coolants are an instrumental part of machining, including grinding, milling, and turning. They help extend tool life and provide an improved surface finish of the parts being machined. Understanding the role and types of coolant help you select a coolant that is the right fit for your machine and operation. By properly maintaining the concentration levels of your coolant, you extend not only the life of the coolant but also your tools and machine.

For your convenience we have combined our US prototype and production services. They were previously known as US Quickturn PCBs and US Full Service PCBs. Now when you get an instant quote our online system will display the best prices based on your printed circuit board specs, quantity and lead time. The unit prices for the prototype PCBs will be displayed with a blue background, the unit prices for the Full Feature PCBs will be displayed with a white background. You do not have to worry about quality because unlike other PCBs manufacturers, the quality of our prototype and production PCBs is the same.

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This is the minimum air gap between any two adjacent copper features. Trace width is the minimum width of a copper feature, usually traces. For trace width/spacing, we require a minimum of 0.005” for 1 oz. finished copper weight on outer layers. Premiums are added for trace/space specs less than 0.008” For 1 oz. finished copper weight (inner layers), minimum trace width/space is 0.005" For 2 oz. finished copper weight (inner & outer), minimum trace width/space is 0.007" For 3 oz. finished copper weight (inner & outer), minimum trace width/space is 0.015" For 4 oz. finished copper weight (inner & outer), minimum trace width/space is 0.020

We recommend that your silk screen features have a width of at least 0.007", although the absolute minimum for clear legibility is 0.006". If you submit Gerber data or a .bin ViewMate file to us, then we will modify your silk screen layers if any features are less than 0.007". If possible, we will set all features so that the minimum trace width is 0.007". Where this is impractical, we will reduce the silk screen feature size to a minimum of 0.006".

PCBs are built to IPC-A-6011/6012 latest revision Class 2 with inspection based on IPC-A-600 latest revision, in addition to customer specified requirements.

Coolants are grouped into four main categories and have a variety of different formulations. Selecting coolant should be based on the overall performance it provides centered around your machining application and materials used.

Standard prices are based on square inch size of your printed circuit board and board layer count (2, 4, 6, 8 and 10 layers).

We accept Visa, MasterCard, and American Express. Bank card transactions are processed electronically through USA Quickturn PCBs secure SSL web site.

During the machining process, the coolant mixture floods over the work area. This process also washes chips and particles away from the work area. Coolant collects in a sump at the bottom of the machine. The coolant is pumped out of the sump and recirculated to the work area.

Both central and single machine coolant systems need to be monitored, maintained, and adjusted. Unfortunately, small coolant systems tend to use less effective equipment for filtration and oil separation in comparison to central systems. Small systems are also susceptible to more rapid changes and greater fluctuations in concretion levels. Therefore, the coolant used in small systems needs to be more tolerant of contamination from metal shavings, tramp oils, and other materials. Not only does the coolant type play a role in extending the life of your coolant, but proper coolant management becomes even more critical.

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Straight Oils: These are not water-miscible and have a composition of a mineral or petroleum oil base and contain lubricants like vegetable oils, fats, and esters. They provide the best lubrication but have the poorest cooling characteristics.

Prototype orders received by Noon PST the following business day is Day 1. Production orders received by 5pm PST the following business day is Day 1.

Semi-synthetic Fluids: Considered to be the best of both worlds, they have less oil than emulsion-based fluids, a less stinky smell, and retain much of the same lubricating attributes. This makes them usable for a broader range of machining.

Types ofcoolantused in machining

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Soluble Oils: The most common of all water-soluble cutting fluids and a great option for general purpose machining. The drawback is that they are prone to microbiological growth of fungus and bacteria if the coolant sump is not correctly maintained.

A minimum of 0.010” for outer layers and 0.014” for inner layers. For scoring, minimum of .015 for outer layers and .020 for inner layers. Copper features closer than the minimum specified edge clearance may be compromised during board routing.

If your design contains both plated and non-plated holes, then we prefer that you place these holes on separate layers. This will ensure that we understand your intent. Name your plated drill layer "PlatedDrills" and your non-plated drill layer "NonPlatedDrills".

Please keep in mind, add 1 lead-time process day for major US Holidays. Major US Holidays do not count as a Business Day.

We can panelize your boards for you. If you send us a panel drawing, we will follow it. Otherwise we can suggest one for you. Boards can be tab-routed (.093 typical spacing) or V-scored (0.0” typical spacing).

Your printed circuit board outline does not have to be square or rectangular. You can submit round boards or boards with a complex shape. Our requirement is that we can convert your outline to a continuous unbroken path. By default, we will rout your board outline with a 0.0625" diameter rout bit. This will result in a minimum radius of approximately 0.032" on inside corners. If your design contains inside corners with radii of less than 0.032", then we will use a 0.03125" diameter rout tool to cut out your board. In this case, inside corners will have a minimum radius of 0.016".

The default rout tool diameter is 0.0625".  All features are cut out using this tool if possible (both internal features and the board outline). Smaller diameters are available upon request.