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-   -   Oversized/ Larger-Than-Pens Mandrel? (https://www.woodworkingtalk.com/f6/oversized-larger-than-pens-mandrel-30510/)

Powers 10-05-2011 11:19 AM

Oversized/ Larger-Than-Pens Mandrel?
 
4 Attachment(s)
Hello all,

The item I turn most is a wooden handle used for spearfishing. Picture below.

Typically, I predrill the hole with a hand drill, then use a spur center on the headstock and a live center on the tail stock.

My problem is it is hard to align the predrilled hole directly in the center of the spur center. I seem to be always just a little off center. Most of the aiming is done down the shaft, so this is more of a cosmetic issue than a functional one.

I am wondering if I should try to locate a mandrel that will fit the predrilled hole (5/16") or if I should try a dead center. I don't own a dead center and have never used one, but it seems to me that the piece might slip in the center.

Should I try the dead center? Or do you know of a Mandrel that could accomodate this? Or, is there some other method of which I'm not thinking?

Thanks!

Will in Austin

brown down 10-05-2011 11:29 AM

why can't you leave a tenon on the end of it and chuck it up. turn your shape and drill your hole than part if off? I have had mandrels made for my game calls, they work great but is 3/4". and was quite pricey to have made.

duncsuss 10-05-2011 12:25 PM

a couple of ideas
 
Have you considered drilling on the lathe?

You could grip the blank in a chuck and put a drill-chuck (I got one from Penn State Ind.) in the tailstock. Drill out the hole, take the tailstock away and turn the piece. (Or turn the piece first, with a live center to support the tail of the blank, then switch to the drill and drill it out before parting off from the stump in the jaws.)

Alternatively ... make your own mandrel. Get a length of threaded rod the correct diameter and grip it in a drill-chuck mounted in your drive head. Slide the drilled blanks onto it. Lock in place with a couple of nuts and away you go.

Whaler 10-05-2011 12:48 PM

3 Attachment(s)
My method of turning shaving brush handles might work. I use a 3/8x16 hanger bolt you could substitute a 5/16, a regular bolt with the head cut off might be better. Drill and tap the hole, screw the mandrel in and mount it in a 4 jaw chuck, collet chuck or drill chuck.

Powers 10-05-2011 12:59 PM

Quote:

Originally Posted by duncsuss (Post 250931)
Have you considered drilling on the lathe?

You could grip the blank in a chuck and put a drill-chuck (I got one from Penn State Ind.) in the tailstock. Drill out the hole, take the tailstock away and turn the piece. (Or turn the piece first, with a live center to support the tail of the blank, then switch to the drill and drill it out before parting off from the stump in the jaws.)

Alternatively ... make your own mandrel. Get a length of threaded rod the correct diameter and grip it in a drill-chuck mounted in your drive head. Slide the drilled blanks onto it. Lock in place with a couple of nuts and away you go.

I've though of drilling it on the lathe, but the necessary hole is just too long for my set up. With my drill chuck and the length of the blank and length of the bit, I run out of room.

I think I'll try to make a mandrel with the threaded rod. Great idea.

Thank you for the response!

Thank you for the response!

Powers 10-05-2011 01:00 PM

Thank you for all the responses. I'll let you know how it goes.

Best,

Will

Gary Beasley 10-05-2011 05:50 PM

Theres bushings you can get for pillcase keyrings that fit a 5/16" hole. If the pen mandrel is long enough for the handle that should work.


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