Fowler Bowers Bore Micrometer

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Fowler Bowers Bore Micrometer

This topic has 5 replies, 2 voices, and was last updated 19 April 2022 at 16:23 by LADmachining.

Viewing 6 posts - 1 through 6 (of 6 total)

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18 April 2022 at 16:20 #594999
LADmachining
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@ladmachining
Hello everyone.

I have recently acquired a Fowler-Bowers bore micrometer, size 5/8 – 3/4", along with a 0.7497" setting ring.

Trying to set the gauge up with the setting ring according to instructions for a similar Bowers non-digital micrometer (model XT, although the one I have is an earlier model). Question is, is it possible to adjust the reationship between the '0' position on the thimble and the line that co-incides with the .625" etc index mark on the barrel? There seems to be some mis-alignment currently that to my mind will make it difficult to interpret the readings taken.

Having bought it from eBay, if there is a fundamental problem with it (i.e wear or damage) that is causing the mis-alignment, it will be possible to return it after consultation with the seller.

Any assistance appreciated.

Regards,
Anthony
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18 April 2022 at 16:20 #20672
LADmachining
Participant
@ladmachining
How to adjust?
18 April 2022 at 16:36 #595002
Martin Connelly
Participant
@martinconnelly55370
Isn't there a small grub screw that can unlock the black tube? Mine has one near where the curve on the larger diameter black shield is. I think this allows adjustment but mine is slightly different as it is marked 0 where yours is .750 as it is a 0.750 to 1". I have adjusted mine at some point in the past but can't remember the exact process but it was not hard.

Martin C

The hole with the grub screw down it is shown more clearly in this photo.

Edited By Martin Connelly on 18/04/2022 16:41:26
18 April 2022 at 16:47 #595003
LADmachining
Participant
@ladmachining
Thank you Martin,

I did a double-take when I first read your post and thought my picture had appeared in your post too. On looking closer however…!

I had gently nipped up that recessed grub screw as per the instructions I read after setting the micrometer to the setting ring. I will have another play and see what else can be done with the screw loosened.

The only other screws present are two very small grub screws that seem to fix the black shroud in place.

Anthony
19 April 2022 at 10:34 #595055
Martin Connelly
Participant
@martinconnelly55370
Have a look at this, it may match your tool

Martin C
19 April 2022 at 16:23 #595094
LADmachining
Participant
@ladmachining
Well after a bit of trial and error, I seem to have everything adjusted and working as it should.

To do this, I removed the ratchet, then the thimble. The threaded rod that drives the anvils was then moved a little by hand and the thimble replaced, repeating until the thimble mark lined up with 0.625" with the index at 0. Once done, the ratchet was refitted and the calibration process completed as outlined in the video Martin posted above. All now seems to be in order!

Thanks,

Anthony
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