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May one chalk a pool cue on shabbat and yom tov? If not, why?

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judaism.stackexchange.com/a/30673 doesn't seem relevant. – msh210 Apr 20 '14 at 21:28
Perhaps Tochein (grinding the chalk)? – Double AA Apr 23 '14 at 3:39

According to Rav Moshe Feinstein re:makeup on shabbos (where he asserts that Tochen-grinding would apply to face powders that are caked) tochen too would be a problem.

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Hello mmt and welcome to mi.yodeya! Can you provide a source for Rav Moshe's p'sak in this regard and a few words of explanation on how it applies to this case? – WAF May 21 '14 at 0:10
Not a written Teshuvah,however it is reported by many of his students. The Star-K, in their Shabbos Cosmetic article (by Rav Heber) quotes it, as does Rabbi Jachter in Grey Matter. Perhaps it is in a more recently published teshuvah, but it is known in the olam ha'psak. – mmt May 21 '14 at 2:18

I've always heard that it's forbidden to chalk a pool cue, as it is being used for marking something. Furthermore, I've always heard that chalk is muktzah, so this is another reason against.

source: אבי מורי

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Marking is not a melacha, the actual prohibition is against writing 2 letters and the Rabbis extend this to cases that may lead to 2 letters, however, marking as an unintended consequence is permitted. Muktzah is something that has no permitted use on shabbat/yom-tov, chalk (assuming it can be used) would not be muktzah. – Yisroel Apr 20 '14 at 19:09
FWIW you probably mean אבי מרי (my father and my master) – Double AA Apr 23 '14 at 3:40
@DoubleAA mori means "my teacher", no? Seems more relevant when citing a source than "my master". :-P – msh210 May 20 '14 at 21:39
@DoubleAA I checked a few benchers (nusach Ashkenaz), and they all say אבי מורי. Among them: ArtScroll, Feldheim, NCSY, Nevarech. – Scimonster May 21 '14 at 7:49
If your father prefers it, then go ahead I guess. The Gemara though is clear that you should source your father as אבא מרי which Rashi translates as אבי ואדוני. – Double AA Jun 10 '14 at 21:42

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