What size drill bit for peg string holes?

November 9, 2019, 8:48 PM · I have several sets of undrilled pegs. What size bit do I need to drill the string holes?

Replies (6)

November 9, 2019, 9:35 PM · Yeah, but what size drill bit do I need?
Edited: November 9, 2019, 10:15 PM · Getting a drill started on a convex surface on hard material is not easy. Especially with a narrow bit. You need to start the hole with some kind of center punch or something and you need to expose very little bit length at the start, and you need some kind of jig to hold the piece very securely on the table of your drill press. Doing even a halfway job on this is harder than it sounds. Good luck getting the hole to go through the center and perpendicular to the peg.

I have gear pegs in my viola but I saved the friction pegs. I just tried to insert a 1/16" drill bit (chuck end) into the string hole of the G-string friction peg and it did not go in. But it felt close, so I' going to guess 3/64" should do it, or maybe 1.0 millimeter. (3/64 is very close to 1.2 mm). Now, remember, those are viola pegs.

Edited: November 9, 2019, 10:50 PM · Yes- I've been away looking at bits- someone on Fiddle Hangout mentioned 1/16", which we all know is 1.5 mm - or at least I knew actually that 1/8" is approx. 3mm, and so divided by 2- 1/16" is about 1.5mm-a little big but probably workable.

so anyway I have several cheap generic pegs that are pre-drilled in the same places roughly- I put my largest cheapie synthetic G string through it, and the string otherwise is smaller than a mm across but not much. Guess I could've answered my own question, but what fun would that be when there's all this stellar advice?

I just ordered some small 1 mm and 1.5 bits from China-takes a long time- and maybe here. I think they'll do the job.


November 9, 2019, 11:11 PM · 1/16"
Edited: November 10, 2019, 2:31 AM · I also use a 1.5mm bit (1/16" after Brexit) in a hand held pin-vise that you twizzle with your fingers rather than crank a handle. Vise and a set of 30 bits cost £7.59 with same-day delivery from amazon.co.uk!
November 10, 2019, 8:23 AM · You can go to your local hardware store or Home Depot to buy these small bits and they are only a few dollars each. I do not work on my own violin but these thin bits can break quite easily if you are not extremely careful when drilling with them.

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