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Oh no, can't use my Bergeon micrometre! Help needed!

VWatchie

By VWatchie
in Tools & Equipment

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VWatchie Distinguished Member

VWatchie

Posted
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Some time ago I bought a Bergeon micrometre (and a Seitz jewelling tool) to be able to replace damaged jewels. The micrometre works perfectly down to the exact hundredth of a millimetre but trying to measure my first jewel I bumped into a very unexpected problem; the height adjustable round table fouls the spindle (circled in red).

I don’t think, or rather I hope, that the micrometre isn’t out of order and can be adjusted so that the spindle does not bump into the table. But searching high and low I just can’t find any documentation or user manual for this type of micrometre. Being a hobbyist having spent a small fortune on these tools, this situation is very frustrating.

So, the question is, what can I do to adjust my micrometre? As I have no clue what the various parts of the micrometre are named, I have given the various parts in the pictures a letter (in yellow) so that if anyone who knows how do this (and takes pity on me :unsure:) more easily can guide me.

Keeping my fingers crossed. Hard!

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Edited by VWatchie
Tried to remove the last picture at the bottom of the post
watchweasol Distinguished Member

watchweasol

Posted
Posted

Hi Watchie   from what I can see  and not ever having used one of these, the table is for supporting parts being measured and in no other way interferes with the actual measurement. So by fitting a shim or disc with a lesser diameter to the table top to allow the arm to clear the table and support the piece being measured  may solve the problem . 

Alaskamick WRT Addict

Alaskamick

Posted
Posted (edited)

it looks to me that if you loosen the two screws A & B then move the micrometer away from the table, move shaft C, which is now loose to the middle of the table E.

Tighten the two screws A & B 

You should the have the meeting point of the two shafts in the middle of the table and both point will be able to meet each other.

Edited by Alaskamick
modify
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VWatchie Distinguished Member

VWatchie

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Posted (edited)
16 minutes ago, watchweasol said:

Hi Watchie   from what I can see  and not ever having used one of these, the table is for supporting parts being measured and in no other way interferes with the actual measurement. So by fitting a shim or disc with a lesser diameter to the table top to allow the arm to clear the table and support the piece being measured  may solve the problem . 

Thanks for the suggestion and the thought had occurred to me (lo and behold ;)) but I really don't think that's how it was designed and meant to be used. @Mark uses a similar micrometer, and here you can see how the table is supposed to support the jewel while being measured. I really don't want to add an extra disc/shim as it will introduce another piece to handle, and I'm not even sure how well it would work. Well, as a last resort I guess it could be OK.

Edited by VWatchie
VWatchie Distinguished Member

VWatchie

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11 minutes ago, Alaskamick said:

it looks to me that if you loosen the two screws A & B then move the micrometer away from the table, move shaft C to the middle of the table E. you   should the have the meeting point of the two shafts in the middle of the table and both point will be able to meet each other.

Yes, I've considered that as an option too, but then the scale wouldn't be correct. I guess if I move it a millimeter I could always subtract a millimeter from the reading, but sooner or later I'm going to forget and mess it up. Anyway, thanks for the suggestion and I might try it if a better (or more correct) way doesn't come up.

Alaskamick WRT Addict

Alaskamick

Posted
Posted (edited)

You shouldn't have any trouble. Once you have the two spindle flats touching in the centre of the table all you have to do is adjust the location of the micrometer scale, as with any micrometer they can be altered easily. It is normal practice.

 

I didn't notice that the ends of the two spindles were Flat.

Just bring them together after loosening the two screws earlier mentioned, then you adjust the scale by loosening collar H, line the micrometer up where you can see it easily then retighten H.

Screw L may lock the micrometer to stop it turning so that will need ti be loosened a little

 

Get the LH side in the right place first with the flat in line with the centre of the table then move to the micrometer side and start altering that.

Edited by Alaskamick
rogart63 Distinguished Member

rogart63

Posted
Posted

if i am correct you should be able to adjust the left pin or what to call it . By unscrewing  the A and B screws . never mind the right pin isn't zero . That you can adjust later.  The big screw on the ratchet is only for  taking the click mechanism  apart inside the handle .  To adjust the zero on the scale loosen the big hex nut on the  back of the scale . And turn the scale to zero .  That way you will get clearance  for the table. 

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FLwatchguy73 Super WRT Addict

FLwatchguy73

Posted
Posted (edited)
41 minutes ago, Alaskamick said:

it looks to me that if you loosen the two screws A & B then move the micrometer away from the table, move shaft C, which is now loose to the middle of the table E.

Tighten the two screws A & B 

You should the have the meeting point of the two shafts in the middle of the table and both point will be able to meet each other.

I believe after he moves C, he'll have to adjust H,L and K to re-establish his zero point, which is C and F touching face to face. EDIT: @rogart63 has it correct!

Edited by FLwatchguy73
corrected info
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rogart63 Distinguished Member

rogart63

Posted
Posted
2 minutes ago, FLwatchguy73 said:

I believe after he moves C, he'll have to adjust H,L and K to re-establish his zero point, which is C and F touching face to face. EDIT: @rogart63 has it correct!

Maybe not 100% . The K can be used to align the zero to the scale to zero .  It no harm in trying . As long as you  arne't loosening tha screws to much.  Look at a  normal micrometer . They work the same way . 

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nickelsilver Distinguished Member

nickelsilver

Posted
Posted

You can definitely move the fixed anvil toward the mic head (to the right). Just enough that you clear the table. On one of mine there is only  maybe 0.10mm clearance, but that's fine. Once you've done that show us what it's doing on the scale and we can advise.

 

The collar H is to tighten a collet that takes up the play on the spindle. You won't need to touch that.

 

 

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clockboy Distinguished Member

clockboy

Posted
Posted

Maybe this vid helps. It looks like its possible to have the the table in the centre when on zero by moving either end and then just  zeroing the micro afterwards.

 

 

VWatchie Distinguished Member

VWatchie

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Thanks guys! :thumbsu: All your support really makes me warm at heart! :wub:

As you can see, there has been some progress. (being someone who barely held a screwdriver in hands before the age of 55 I feel pretty proud of myself). Anyway, can't get the scale right. I loosened the big hex nut (even removed it as you can see) but the nut seems to be fixed to the screw, and no matter how I fiddle with it nothing happens. I guess something else has to be done to get it right...

Keeping my fingers crossed you can help me again!

nickelsilver Distinguished Member

nickelsilver

Posted
Posted

Put the screw/nut back on, you don't need to move the thimble (the barrel with the graduations 0-99). For future reference, it's held in place with that screw/nut, but is fitted on a taper and needs some coaxing to get off and move around.

 

If you loosen screw K you can move the inner sleeve, it will just slide around. Get it where you want it and tighten K and you're done.

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Alaskamick WRT Addict

Alaskamick

Posted
Posted (edited)

The nut you have undone is only part of the micrometer mechanism, nothing to do with the mounting of the unit.

As I said in my earlier post try loosening screw L which I think locks it in place. also try undoing the  Ring H.

Something frees it up and allows it to move back and forth

Edited by Alaskamick
VWatchie Distinguished Member

VWatchie

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Mission accomplished. The Eagle has landed!

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So, I’m all good to go! Just can’t thank you enough guys! I know that for you seasoned repairers this is nothing special, but me, well, I feel like I’ve successfully taken off in a rocket! :lol:

For those of you finding this thread in the future here’s some additional info that I learned on the way.

After having removed screw A and B the spindle C just wouldn’t move pulling it by hand. So, I tapped on it ever so lightly horizontally in the direction towards spindle F and it moved in increments. To tap I used the plastic part of the hammer in the picture.

I also needed to rotate the spindles C and F slightly. I did this by grabbing on to the thick part of the left spindle C (after having tapped it out a bit) with pliers with a bit of transparent and though plastic film (zip bag) in between the pliers and the spindle. To rotate the right spindle F I simply used a small BAHCO adjustable wrench.

Loosening screw K as @nickelsilver and  @rogart63 point out is indeed the way to get the scale back to normal! The inner sleeve can then slide as well as rotate without affecting the thimble (the barrel with the graduations 0-99).

I’m really thrilled to own this beautiful precision tool! It gives me the same feeling that I get from looking at a really fine watch movement.

So again, a really big thank you to all of you! :thumbsu:
 

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