Tuning

Reamer and pin diameter

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Started by

Gib

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Opening post by Gib

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Bat

Good morning, I am changing the center pins on some slightly stiff forcole.

(So far I have done a couple and the friction has dropped to 5gr)

Since the pins are all 1.37mm, what should be the diameter of the reamer to use?

Furthermore, it has often been said that the pin needs to be increased by 0.25mm...

so in my case do I need to use 1.62mm pins?

Thanks to anyone who can help me

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Reply 2 by pianoexpert

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rocca di papa

unfortunately there is no precise rule. It depends on how much the cashmere gasket gives or how rigid it is. The increase can very well be from 1.40. The reamers must not be conical! You have to look for straight reamers. Difficult to find. Only experience will help you choose the right one, which will have the right friction "at the moment" and ...especially "over time"!!!!!!

If the work is correct, by locking the fork and taking the stylus with two fingers..the rod must not oscillate!!!!!!!

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Reply 5 by Gib

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Little doubt...

In most cases I am only ironing the cashmere without reaching the point where the iron feels rough...

Is it still correct?

Or must I necessarily wear down the cashmere a little bit?

Otherwise, doing it this way, I will find myself with a very wide hole...

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Reply 6 by pianoexpert

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it cannot be said from a distance. every gasket reacts differently. it depends on its age and its compaction.

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Reply 7 by Gib

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Agreed

Unfortunately, some pins do not come out easily from the forkeys... How could I solve the problem?

Is there a "trick" to facilitate their removal?

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Reply 8 by pianoexpert

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I don't want to be pedantic. Pin work is delicate work that requires experience and proper equipment. You cannot do a remote "do-it-yourself" course. Some things are good for the pianist to learn, because they can be done even without experience, but delicate interventions must be entrusted to an experienced technician. You will surely be good, but if you encounter difficulties, you should rely on someone. In this case, an extractor that extracts and inserts is needed. If the pin is as hard as you say (but I don't believe it, otherwise the hitch pin would be stuck)... then replacing the part must also be taken into consideration. It is impossible to tell from a distance.

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Reply 9 by Gib

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Unfortunately due to commitments, I haven't had more time to respond and finish the work...

Anyway, I understood where the problem was

Fortunately, the pins were not having difficulty coming out of the forcole but from the hole in the wood which was a bit tight (for example, that of the upright)

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Reply 10 by GuidaEnzi

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9
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Andria

Good evening. I will take advantage of this discussion to ask for information regarding the sanders from the shop ftppianoforti.com. Do they have an abrasive part or are they completely smooth?

I sent an email to the shop and they replied that they are completely smooth.

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Reply 11 by Gib

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The round ones (for the center pins) have a small abrasive part a few cm from the handle

I don't know about the conical ones, but it depends on how you will use them

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Reply 12 by GuidaEnzi

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Andria

Thank you very much for the information.

Yes, I was referring specifically to those round calibrated ones with a wooden handle (for the center pins).

It seemed strange to me that they didn't have any abrasive part.

If I'm not asking too much, would you be able to post a photo?

PS. I read city of residence BAT, I am from Andria. If BAT is a reference to the province, maybe we could meet up if you have no objection.

I would like to see them in person before buying them. The photos on the website are unfortunately very low resolution and without details.

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Reply 13 by Gib

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Unfortunately, I cannot post photos on the site...

All in all, they are nothing more than a kind of iron "toothpick," about 15cm long with a rough part at the end before the handle

If you wish, I can send you some photos via email or WhatsApp

GuidaEnzi wrote:

21 hours ago, GuidaEnzi said:

PS. I read city of residence BAT

Barletta anyway...

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Reply 14 by GuidaEnzi

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Andria

Thank you very much for the information.

I have sent you a private message on the forum with my contact details.

Have a good day.

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