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Forum topic by airman posted 1373 days ago 1206 views 0 times favorited 21 replies Add to Favorites Watch
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airman

48 posts in 1818 days


1373 days ago

drill a straight hole!!?? Just got thru turning a pepper mill. Using the marks from the lathe I drill the hole for the mechanisms and the hole is not centered. I checked the drill bit to be sure that it was 90 degrees to table and that the mill also ninety degrees. The hole still exited off center. This is not the first time this has happened to me. Maybe I should try for off center and then it would drill true.


21 replies so far

View a1Jim's profile

a1Jim

112000 posts in 2179 days


#1 posted 1373 days ago

If your using a drill press your table might not be set to 90 degrees

-- http://artisticwoodstudio.com Custom furniture

View Dennisgrosen's profile

Dennisgrosen

10850 posts in 1717 days


#2 posted 1373 days ago

when you stand infront of your drillpress you maybee have set the table 90 degree left to right
but have you checked it in out that it is in level
just a thought

Dennis

View ChuckV's profile

ChuckV

2378 posts in 2129 days


#3 posted 1373 days ago

I do not know how you are supporting the piece on the drill press table. But, once you have the table set 90 degrees to the bit, you need to also be sure that that the piece is 90 degrees to the table both left-to-right and front-to-back – in other words, parallel to the bit.

Best wishes.

-- “That it will never come again / Is what makes life so sweet. ” ― Emily Dickinson

View interpim's profile

interpim

1123 posts in 2060 days


#4 posted 1373 days ago

why not get a jacob’s chuck for your lathe and use the tailstock to drill your hole. That way the piece stay’s in your chuck. I use a cheap Jacob’s chuck from HF and it works great.

-- San Diego, CA

View Howie's profile

Howie

2656 posts in 1524 days


#5 posted 1373 days ago

How long is the bit? Are you pressing too hard and causing it to flex? Just a thought.

-- Life is good.

View shipwright's profile

shipwright

4843 posts in 1399 days


#6 posted 1373 days ago

What kind of bit are you using? If this is a pepper mill, you are likely drilling down the grain. A forstner bit will be less likely to wander than a twist drill or spade bit.

Paul M

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/

View Dark_Lightning's profile

Dark_Lightning

1671 posts in 1710 days


#7 posted 1373 days ago

Depends on the size of the bit. Skinny bits tend to wander, following the softer grain. It also possible that the end you marked (live center, probably) may not have been square to the centerline of the pepper mill. Did you hole the mill in a clamp or vise when drilling? This will also cause the problem.

View lew's profile

lew

9951 posts in 2357 days


#8 posted 1373 days ago

Interpim hit the perfect solution.

I had the same problems and tried everything to get a perfectly centered through hole. Finally, got the jacobs chuck for my lathe and haven’t had any trouble since. If you are using forstner bits, also get an extension for the bits. It really saves time because you don’t have the rotate the blanks half way thru.

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View richgreer's profile

richgreer

4522 posts in 1676 days


#9 posted 1373 days ago

The right (perhaps only) way to make a pepper mill is to drill the hole before you turn it.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

View hairy's profile

hairy

1988 posts in 2134 days


#10 posted 1373 days ago

If you have a live center, you could drill the hole in the blank before you turn it. You put a cone on the center, then put the cone into the drilled hole. I used that on a cane.

There are others, but I know this one.

-- the last of Barret's Privateers...

View shipwright's profile

shipwright

4843 posts in 1399 days


#11 posted 1373 days ago

Of course you’re right Rich. You know they say common sense just isn’t common any more. Fortunately some (you) still have it. Good call.

Paul M

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/

View crank49's profile

crank49

3338 posts in 1572 days


#12 posted 1373 days ago

It’s always best to do as many operations as possible with a given setup.
While the part is chucked in the lathe is the best time to drill it, like “interprim” said, using a drill in a Jacobs chuck, mounted in the tailstock
Unless the part had to be supported by both the chuck and the live center in the tailstock at the same time.
In the later case, Rich hit it. Drill, then turn.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

View TheGravedigger's profile

TheGravedigger

963 posts in 2626 days


#13 posted 1372 days ago

I’m with hairy. I make it a habit, whenever possible, drilling the hole on the lathe first, then turning around the hole.

-- Robert - Visit my woodworking blog: http://littlegoodpieces.wordpress.com

View sras's profile

sras

3780 posts in 1731 days


#14 posted 1372 days ago

If you do need to drill a deep hole and keep it straight, one thing that can help is to back the bit out and maek sure the chips are clear out of the bit. If the bit gets clogged it can make it easier to wander. This is especially true for smaller diameter bits.

-- Steve - Impatience is Expensive

View TopamaxSurvivor's profile

TopamaxSurvivor

14604 posts in 2277 days


#15 posted 1372 days ago

What lind of bit? A self feeding auger will drill straighter than a twist drill. A shell auger is better yet. Check this out http://lumberjocks.com/reviews/1694

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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