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Precision inside bore gauge for measuring bores for: dimensional accuracy, ovality, taper.
Self-centering with interchangeable feeler tips. Supplied with dial indicator.
| Measuring range (mm) | Inserts | Discs | Extensions | Measuring foot |
| 6–10 mm | 9 | - | - | 40 mm |
| 10–18 mm | 9 | 1 | - | 100 mm |
| 18–35 mm | 9 | 1 | - | 150 mm |
| 35–50 mm | 4 | 4 | - | 150 mm |
| 50–160 mm | 12 | 4 | 1 | 150 mm |
| 160–250 mm | 5 | 5 | 1 | 250 mm |
Design
The precision inside bore gauge is a comparison measuring device for measuring internal dimensions, usually bore diameters. It consists of a measuring head and a shaft, at the end of which the dial indicator is mounted.
On one side of the measuring head, a fixed measuring stop is mounted. This can be replaced, thus adjusting the measuring range of the device. This allows large measuring ranges to be covered. Opposite is a moving measuring bolt, whose movement is transmitted to a rod in the shaft and thus to the measuring bolt of the dial indicator. Depending on the model of the precision inside bore gauge, the travel of the moving measuring bolt is 1-3 mm.

a moving measuring bolt b fixed measuring stop c spring-loaded stop bridge with yoke-shaped ends d shaft e redirection of the measuring bolt movement by lever
Pre-setting
With the precision inside bore gauge, measurements with very low error limits are possible, provided that the pre-setting and the measurement are carried out correctly. Before use, the precision inside bore gauge is pre-set as follows:
The interchangeable measuring stop is mounted that brings the length of the measuring head closest to the dimension to be measured. The dial indicator is inserted with a slight pre-load (approx. 1-2 turns) and clamped.
Since the dial indicator only determines the deviation of a known dimension, an exact internal dimension must be defined using a comparison standard. The comparison standard can be, for example, a dial test indicator, a setting ring or another setting device. The scale of the dial indicator is now set so that the 0 on the scale aligns with the position of the pointer at the reverse point. This should be done as accurately as possible to exclude errors in measurement.
Measurement
The spring-loaded centering bridge on the side of the moving bolt centers the measuring head in the bore. In the horizontal position, the measuring head must be aligned by hand to find the reverse point of the dial indicator: You swing the measuring device slightly back and forth until you find the maximum deflection of the pointer of the dial indicator (reverse point). This is the desired measured value.

a Set the measuring device with a setting ring or end gauge to the comparison standard; set the dial indicator to zero b Insert the measuring head into the bore; determine the bore dimension at the reverse point of the pointer by swinging motion; read the deviation
Evaluation
The measured dimension must now be compared with the pre-set comparison standard. If the reverse point of the pointer is after the 0 on the scale, the dimension is smaller. Thus, the measured value is subtracted from the comparison standard. If the reverse point is before the 0, the dimension is larger and the measured value is added.
Measured size = Comparison standard - Measured value
Example:
The precision inside bore gauge was pre-set to 70 mm and a deviation of 0.02 mm was measured. The diameter of the bore is therefore 70 mm – 0.02 mm = 69.98 mm.
Answers to frequently asked questions
At ASIMETO Germany, you receive measuring tools and inspection equipment with an excellent price-performance ratio. Just a few clicks and your products are on their way to you. Orders are shipped on the same day if possible, so you usually receive your tools within 1-2 days.
With our many years of experience, we can advise you on all aspects of length metrology and assist you in choosing the right measuring tool. We also offer additional individual services such as calibration and laser engraving for many
products.
You can reach us by email: kontakt@asimeto.de or by phone (weekdays from 8 AM to 3 PM): 07940 9836622.
We offer factory calibrations and laser engravings for many of our products. We carry out both in our in-house laboratory. This only minimally extends the delivery time. We also offer DAkkS calibrations on request. If the additional option cannot be ordered for the desired product, please contact us.
You can order from us directly through our online shop, by email, or by phone.
We will gladly send you a written offer by e-mail. Please contact us.
If you are a business customer and would like to pay by invoice, you can register via our B2B registration form. The payment option will then be activated for you.
Unfortunately, purchase on account is not possible for private customers.
We ship your package with GLS (free shipping within Germany for orders over €50), or with DHL for an additional charge.
Exception:
Surface plates (from 630 mm size) and profile projectors are shipped by freight forwarding. The costs incurred for this will be displayed at checkout.
Orders from Germany (standard shipping) usually reach their recipient within 1–2 business days.
You can return products from your order within 30 days and receive a refund of the purchase price. Shipping costs are to be borne by you.
You can initiate a return in your account under "Orders" or at the bottom of the page using the "Cancel contract" button.
Send us a message if you have any questions about products or orders.
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