Precision Machining in Toronto - The Importance of Accuracy

March 29, 2016

Precision Machining in Toronto - The Importance of Accuracy

Finding a good source of precision machining in Toronto can be an arduous process if you do not know what to look for. Precision means being exact and accurate, requirements that are very important in machining. Due to the fact that a large number of products undergo precision machining, the process has to follow strict specifications. In a large city like Toronto, precision machining is easily accessible when you contact a reputable company. Measurement tools are very common in precision machining to ensure that parts have tighter tolerances. There are handheld tools available for skilled operators in various types, to ensure complete accuracy and precision.

Measurement tools for precision machining

Rulers and tape measures

Measurement tools, like rulers and tape measures, can be used to their fullest potential in measuring large parts. Rulers used in precision machining are not the typical items you find in homes; they are steel calibrated rulers that can be used with confidence. The precision steel calibrated ruler has an accuracy of 0.001 of an inch, depending on the ruler’s length. The longer the ruler, the larger are the tolerances. Tape measures follow the same tolerance guidelines, although the margin of error is often larger. The level of accuracy of precision tape measures is about ±1/32 of an inch, however beyond 12 feet, the tape measure’s accuracy is approximately ±1/16 of an inch.


The most important measuring tool, widely used by skilled professionals operating out of Toronto, in precision machining is the micrometer. The micrometer can be used for very fine measurements; it needs to be set to zero (or to standard) by the friction thimble or the ratchet, whichever is available. Once the micrometer has been set to the flat standard, you can achieve an accuracy of approximately 0.0001 inches in difference. In order to get the most precise measurements, it is important not to rush the work.

Micrometer depth gauge

The micrometer depth gauge is used in precision machining, in Toronto as well as across Canada, to measure the depth of holes, slots, recesses and other geometries. You have a choice from the electronic, mechanical-digital, and standard readouts. The measurement tool is composed of a hardened, ground and lapped base that is combined with the micrometer head. The measurement rod is inserted through a hole in the micrometer screw and brought to a positive seat by a knurled nut.

Slide calipers

Another precision instrument tool used for measurement is the slide caliper; it offers more measurement range than a single micrometer. Slide calipers can be mechanical, electronic, dial, vernier, and plain. Digital and dial slide calipers are accurate to about 0.001 of an inch for every 6 inches, regardless of the resolution. Vernier calipers are accurate up to 0.0005 inch per foot. A general rule in the use of slide calipers is to use good judgment when setting the minimum measuring pressure, often in the half pound range. Individual feel of skilled operators in precision machining is very critical to gain the most accurate measurements. A skilled operator who has developed their “feel” is more sensitive in easily detecting a difference in contact due to changes in dimension that can be as small as 0.00025 of an inch.