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advice on mounting a blank

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Forum topic by Karda posted 09-23-2018 05:56 AM 1034 views 0 times favorited 65 replies Add to Favorites Watch
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Karda

1320 posts in 755 days


09-23-2018 05:56 AM

I have a bowl blank I am not sure how to mount. the part that would be the logical bottom has a serious crack in it, its not long but it is deep. I have laid out the circle on the large side but the other side is flatter and will work smoother on the circle jig, how do you judge where to place your center on the small side, the billet was cut from the side of the log. the billet is about 3 inches thick. any help is appreciated thank mike


65 replies so far

View mahdee's profile

mahdee

4021 posts in 1968 days


#1 posted 09-23-2018 11:44 AM

3 ways,
1- drill a small hole through it
2- put it on a piece of cardboard, mark the parameters
3- measure the distance from all 4 sides to the center

Use squares or blocks of wood beside the edges to serve as borders.

-- earthartandfoods.com

View greatview's profile

greatview

133 posts in 3358 days


#2 posted 09-23-2018 11:54 AM

Fill the crack with black tinted epoxy and the crack will become a feature.

-- Tom, New London, NH

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LeeMills

618 posts in 1502 days


#3 posted 09-23-2018 01:48 PM

What mahdee said in 2-
Lay out the circle on cardboard and draw your circle and cut it out.
You can then eyeball it from the other side to mark the location for the center pin hole.

-- We cannot solve our problems with the same thinking we used when we created them. Albert Einstein

View Nubsnstubs's profile

Nubsnstubs

1422 posts in 1931 days


#4 posted 09-23-2018 03:47 PM

I would do it this way. Measure the length of the piece. Divide it in half, and put a mark at that dimension. Measure the width, and divide in half. Place your mark at that dimension. You should now have an X that marks the spot. Remember those dimensions. You will need them for the other side.

Turn the piece over and do the length first. Take a square and put it up against the edge of the bark. Measure from the square and use the width dimension to mark the center. If you use the same end and same edge to mark from, both marks should be at the same location even though they are on apposing sides of you blank. Get a compass and mark the diameter, cut it, and then mount it onto your lathe. It should be centered.

I would try to center the piece rather than have my round edge next to the square edge like you show in the first picture. ................. Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

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Karda

1320 posts in 755 days


#5 posted 09-23-2018 09:02 PM

Thanks for the suggestions, I measured it like Jerry suggested and got a nice 7.5 ” blank. But what to do with the crack. As its cut it will hollowed out but I could have it on the bottom as well. I would normally have the cracked side on the bottom as the bottom because of the curve of the wood but is that wise now thanks Mike

View Nubsnstubs's profile

Nubsnstubs

1422 posts in 1931 days


#6 posted 09-24-2018 03:18 AM

Mike, that crack, in my opinion, is not an issue. If it was as wide on the right side as it is on the left, I might have some concern, but it just doesn’t look like it would scare me.

Show a picture of the crack since you already cut it round. ............... Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

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Karda

1320 posts in 755 days


#7 posted 09-24-2018 06:08 AM

here are pics of the crack, it is 3/8s inch deep at the widest point

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MrUnix

7046 posts in 2400 days


#8 posted 09-24-2018 06:17 AM

I’m with Jerry – that doesn’t look like much of an issue at all. Turn it like normal, and if it’s a problem as you get close to final form, give it a good fill of epoxy.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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Karda

1320 posts in 755 days


#9 posted 09-24-2018 06:03 PM

ok i’ll turn as is, I a little new at cracks. What kind of colorant could I mix with the epoxy, black maybe

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Karda

1320 posts in 755 days


#10 posted 09-27-2018 09:56 PM

Hi me again. I have the blank rounded and a tenon made but i can only think of a couple styles to turn I need some creative help what could I turn with this. Because of the crack it is backwards. One issue is the top curves inwards because of the live edge parts also the crack in the previous pictures does run down the side to a small knot. My plan was to put the knot on the bowl top and turn it out, could i put the crack on the bottom, I put 3 3/8s dowels through the crack on top. Here is a profile of the bowl and a pic of the side crack. Thanks Mike

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Nubsnstubs

1422 posts in 1931 days


#11 posted 09-27-2018 11:07 PM

Mike, go to your post you did awhile back named “Tear Out”, and look at the pictures in reply #10. It’s a picture of a small cotton wood Ogee bowl with a foot.. What you have there is begging to be a footed Ogee bowl somewhat larger than the one I posted.

Start at the top and work your way down to the foot. You might be able to remove the crack as you’re turning.After the outside is done, do the innards. That mounted blank does not require it to be a deep bowl. If you look at the top picture, the bark line shows you what the profile could look like if you picture it on both halves.

When I first started turning back in ‘09, I didn’t like the Ogee form, but now, I find they are so easy to do and if done right, are very pleasing to the eye.

I hafta ask.. After you get to the point you are in the last 2 pictures, then pose your question on LJ’s, how long do you wait before you go back out to your lathe and start turning?? It’s a burning question I need to have an answer to….... ...... Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

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Karda

1320 posts in 755 days


#12 posted 09-28-2018 12:47 AM

I hafta ask.. After you get to the point you are in the last 2 pictures, then pose your question on LJ s, how long do you wait before you go back out to your lathe and start turning?? It s a burning question I need to have an answer to….... ...... Jerry (in Tucson)

sorry Jerry I don’t understand your question

I liker ogees as well I am still having a hard time getting the shape usually what I get is a flared bowl nice but not what I was aiming for. Question what is the top. the way that blank is mounted that is the top and where the crack is the other end is a tenon. Should I use the crack end for the bottom. The crack is the problem, I don’t know how to handle it, it is doweled I am also thinking of one for the side crack.

- Nubsnstubs

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Nubsnstubs

1422 posts in 1931 days


#13 posted 09-28-2018 02:31 AM


I hafta ask.. After you get to the point you are in the last 2 pictures, then pose your question on LJ s, how long do you wait before you go back out to your lathe and start turning?? It s a burning question I need to have an answer to….... ...... Jerry (in Tucson)

sorry Jerry I don t understand your question

I liker ogees as well I am still having a hard time getting the shape usually what I get is a flared bowl nice but not what I was aiming for. Question what is the top. the way that blank is mounted that is the top and where the crack is the other end is a tenon. Should I use the crack end for the bottom. The crack is the problem, I don t know how to handle it, it is doweled I am also thinking of one for the side crack.

- Karda


Mike, maybe if I changed POSE to ASK, would the question be any clearer? Maybe my Cajun upbringing is too much for a New York Yankee??

I forgot you like the worm screw and probably have the blank mounted that way. So, with the shape of the blank in your reply #7 in this thread, I think you should put the tenon on the side shown, the crack side, and get the maximum diameter of the bowl. It looks like you would lose about 2-3” in diameter if you put the crack and that bark at the top of the bowl.

I want to see the dowels…...... Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

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Karda

1320 posts in 755 days


#14 posted 09-28-2018 03:15 AM

Its all in the crack, after I mounted and turned to the point its at I still don’t know what to do with the crack Instinct says use the side with the bark AS the bottom because it already has a bowl shape, but thats where the crack is. Be glad we are having this conversation. A few months ago I would have trashed the piece or turned the crack away and made a saucer or shallow dish and that would have been a waste of would and a chance to learn lost. I am kinda thick and don’t do puzzles well. Yea I like the worm screw but that is survival. If all I had was a face plate I would have to hammer and chisel flat spots to mount a face plate. I am not a surgeon with a chain saw, and my siurfaces are seldom flat, with a screw there is frequently enough to mount that

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Karda

1320 posts in 755 days


#15 posted 09-28-2018 10:23 PM

ok here is where I m at: no foot Im not that talented like Jerry. it looks like a witches cauldron ok that will turn out nice if you don’t look at the bottom where the are screw holes from the face plate when I mounted on the wrong end. is there a creative way to deal with them other than turning them out

showing 1 through 15 of 65 replies

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