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Telescopic bore micrometer?

This is something that has intrigued me for a while, as I'm sure I used them at college for measuring engine cylinder bores, but have never came across them since and I'm beginning to question my memory.

They were a micrometer like a Telescopic gauge, but with a micrometer head being at the end of the handle instead of the a locking device. You stuck them down the bore, spun the head, read the reading, and repeated without having to remove it from the bore.

I've tried numerous google searches, but despite several attempts, have always drawn a blank.

Do such things really exist, and what are there proper name? Or am I just starting to lose the plot?

moray

Reply to
moray
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Yes they exist! I would call them bore micrometers or Bowers micrometers as thats the ones we use at work.

No you are not losing the plot! The modern day equivalent are these

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all digitised and capable of data collection. They also come in analogue. I have also at work some Moore and Wright bore gauges which are very old and don't appear in the latest catlogue
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and sound exactly as your description. I also have some telescopic bore comparitors which don't have the micrometer attachment, you use them in conjunction with an ordinary outside micrometer or height stand. Basically they are T shaped and the top of the T is spring loaded and is locked in place by using the long bit of the T. I will take some photos tomorrow if you are interested?

Hope that helps Andy

Reply to
AndyN

Have you done a search on UK or US E-Bay using "dial bore gauge" and search in 'business and industrial', lots of 'em are available.

Reply to
Radish1us

Thanks for that. Going by the various catalogues and links I've looked at, I'm guessing the offical name will be something like 2 point bore micrometers. I'm also guessing that they're pretty rare items, as all the searches (google + ebay) I've tried have so far only come up with 3 point bore micrometers/gauges, or standard internal micrometers.

I'm pretty sure the set we got to use at college were Mitutoyo, but I can't find anything on their site.

Thanks moray

Reply to
moray

The Moore and Wright micrometers are not micrometers after all, they have a ratchet on the end of the spindle but no scale. They have a ball contact rather than a pad or blade but are definitely 2 point contact.

The telescopic bore gauges are called that on the wallet they are in and were made by Oldak. I've not done any searching for those as I've been way too busy at work today.

Andy

Reply to
AndyN

Hi I also have a set of M&W internals, they are OK for bores over about 1 1/4". you can get quite a long way down the bore as they come with a tee bar to fit on the side, however I mostly use telescopics and outside mics. Peter

Reply to
petercolman45

search for bore gauges on ebay. A few on there if something like item #260276658842 is what you mean.

Wayne...

Reply to
Wayne Weedon

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