Page 9 of 24 FirstFirst ... 456789101112131419 ... LastLast
Results 121 to 135 of 347

Thread: Coquina

  1. #121
    Join Date
    Mar 2007
    Location
    Adelaide
    Posts
    2,139

    Default

    Hi Mr. Barnacle very kind of you, both the offer and the interest.

    The keel is 5" wide at max. so at 2" the DF would not quite get there I think but sounds like you have some great spar making material or anything else for that matter. I'll certainly look forward to the dimensions I've still to decide on some stuff for the inwhales not sure if my stash of celery top is going to stretch that far.

    I got brave tonight and used the electric plane to take the garboards down to the inner keel. Even though I'm ready to hang the second planks seems I'll find anything to do to avoid mixing that darn epoxy.
    Mike
    "Working to a rigidly defined method of doubt and uncertainty"

  2. # ADS
    Google Adsense Advertisement
    Join Date
    Always
    Location
    Advertising world
    Posts
    Many





     
  3. #122
    Join Date
    Dec 2008
    Location
    Reeves Plain, South Australia
    Posts
    8

    Default Coquina - outer keel

    Dimensions of that douglas fir - I had forgotten that I salvaged these pieces from a ladder that was made in the 1940s and never finished, so while it is as near as dammit to 2" wide, the usable width is one and seven eighths because of the little lodging rebates for the treads cut along one edge. The thickness is inch and an eighth.
    The length is about 17 feet definitely over 16 though I can't get it out of where it is to measure accurately without moving a bit of stuff. Looking at the visible part, it is every bit as good as I thought it was and has never been varnished, oiled or otherwise coated.

    Though I doubt that there would be enough there to rip it down into staves for a hollow spar, I suspect a couple of other uses could be found for it in Coquina.
    Let us know how we should proceed. My email is [email protected]

    All the best

  4. #123
    Join Date
    Mar 2007
    Location
    Adelaide
    Posts
    2,139

    Default

    Email sent Mr. B
    Mike
    "Working to a rigidly defined method of doubt and uncertainty"

  5. #124
    Join Date
    Mar 2007
    Location
    Adelaide
    Posts
    2,139

    Default

    Busy day today after planing the garboards flush with the inner keel this week I did another dry fit of the 2nd planks and like with the garboards was not happy with the bow section.
    So I decided to re mark all station 2 plank lines to correct the misalignment before the glue up (did both #2 at the same time)
    Now at this point I did discover is it is just as well I'm doing glued lap and not traditional, pretty sure my little boat would sink if it was. . I miscued a little on the beveling as it twists through the gains and ended up with a less than close fit.

    Attachment 144674Attachment 144673

    Then onto finishing the scarfing on the outer keel. I rough cut the joint on the bandsaw but due to my poor judge of blade drift there was a fair bit to plane. Ah well patience and a sharp blade made it a pleasurable hour or so. The pile of shavings tells the story and that's only half of it. I employed a length of alloy tube to ensure alignment for the glue up.

    Attachment 144676Attachment 144684

    Finally a pic of my new assistant she is not much good at holding things and really lousy at reading plans but she does give me a sympathetic look when things go wrong. You will notice she was not interested in getting her photo taken either.
    With a bit of luck and the bad weather forecast I might be able to get away with another day in the shed tomorrow.

    Attachment 144677
    Mike
    "Working to a rigidly defined method of doubt and uncertainty"

  6. #125
    Join Date
    Mar 2007
    Location
    Adelaide
    Posts
    2,139

    Default The keel

    I believe the outer keel is a critical bit to get right. It needs to be straight, centreboard slot needs to be correctly positioned and aligned and even though it's usually out of sight the nice shaping should be even and accurate. This operation has proved to be fairly time consuming but fun non the less.

    Planking has stopped at #2 while the outer keel is formed and fitted along with the skeg. I noticed this sensible approach in the photo set I bought with the plans, makes fitting a lot easier.

    The scarfing to the outer keel has had several days to fully harden so I layed out the centreboard slot in preparation for cutting as the first job. This operation has been giving me some concern for a couple of reasons first I was having difficulty in working out how to measure off its position accurately from the plan. Not that it necessary needs to be absolutely millimetre perfect in my opinion but I thought it would be nice to be close.
    Now the plan is scaled at 1 1/2 " : 1' and measuring with a rule and trying to convert has been proving fraught with danger for me but then I noticed a row of dots along the keel line and wondered what they could possibly represent mmmm..........the stations are 20" apart and there are 10 dots between them and they are aligned with the bow edge of the station molds, how convenient thankyou Mr. Hylan.

    Attachment 145351

    So now reasonable confident about its position how do I ensure it is aligned accurately along the keel. I did make an effort to glue the scarf joints straight and the board had been squared before I ripped the sections so I'm confident I can register a router fence off one edge.

    First job is to set up a centre line in this case as I have a few imperfections along one edge it is off set using a string line (red whipping twine really good for the job).

    Attachment 145357

    Next mark out the width for the slot and keel dimensions from the table in the plans. At this point I did need to make a slight adjustment due to my hog being slightly undersize causing the planed flat of the garboard ply to be wider than the plans expect. The result is only between an 1/16 to an 1/8 but important I think to allow for and it's easy to go along and remeasure at each station.

    Attachment 145352Attachment 145353Attachment 145354
    to be contd.
    Mike
    "Working to a rigidly defined method of doubt and uncertainty"

  7. #126
    Join Date
    Mar 2007
    Location
    Adelaide
    Posts
    2,139

    Default Keel contd

    After marking out the next operation is to rough cut the slot and trim with a router using the still straight edge of the keel to reference off. First I drilled a 3/8" hole at each corner then two circular saw cuts using the drop method (brave eh ).
    Then finish the cut with a Japanese rip saw before trimming with a router, notice my heavy duty stop blocks, never again will I trust my eye when routing.

    Attachment 145358Attachment 145359Attachment 145361Attachment 145360
    Mike
    "Working to a rigidly defined method of doubt and uncertainty"

  8. #127
    Join Date
    Mar 2007
    Location
    Adelaide
    Posts
    2,139

    Default Keel still contd

    More about the keel.

    After a congratulatory cup of coffee for cutting the slot without stuff up I pinned battens at the mark points to rough cut the keel outline. The circular saw has a piece of perspex as a base plate with a couple of ply discs to run along the batten very quick and easy way of doing it (acknowledgment John Brooks). Again using the batten as a guide the edge is trimmed with a flush cut router bit.

    Attachment 145366Attachment 145367

    Next job is to plane the bevel (chance to show off my new apron plane )

    Attachment 145368Attachment 145369

    With the bevel completed your very amateur boat builder needed a rest and to have a think about the next step. Mr. Hylan suggests in his promotional material that the skill level for Coquina is "skilled amateur" well that maybe so but I think he threw in the graduated cove (my terminology) along the edge of the keel to see just how skilled the amateur is!
    I'm sure there is a relatively speedy way of doing this it's just that I have now idea what it is. Perhaps if I had a nice sharp gouge to rough it out that would help but I don't have one so patience and a gooseneck scraper is my approach.

    Attachment 145370

    That's it for the minute.
    Mike
    "Working to a rigidly defined method of doubt and uncertainty"

  9. #128
    Join Date
    Jan 2005
    Location
    Melbourne
    Age
    63
    Posts
    11,998

    Default

    Mike, looking good from here. Dunno how you blokes can do boats, very tricky I reckon.

  10. #129
    Join Date
    Mar 2007
    Location
    Adelaide
    Posts
    2,139

    Default

    Thanks Greg, actually the good thing about boats is it the little goofs can be easily reworked or hidden.
    Mike
    "Working to a rigidly defined method of doubt and uncertainty"

  11. #130
    Join Date
    Mar 2007
    Location
    Adelaide
    Posts
    2,139

    Default Stem

    The dog and I took a trip last week to see Mr. Barnacle. Despite his crusty forum name suggesting otherwise John is a very obliging bloke and what's more I reckon he has probably forgotten more about boat building than I will ever know. He very kindly offered me some long lengths of Oregon and they are perfect for the inwhales thanks Mr. Barnacle.

    Work continued on the keel this week and during the dry fit I rough cut the outer stem on the bandsaw to test fit. Seems a problem occurred during my making the pattern or the initial marking out was not good as there was a significant gap between the keel and stem as the first pic shows......oh no .
    A bit a rest on the moaning chair and I think ah just make a filler piece no problairmo. Then I looked at it a bit more and figure it is worth trying a bit of a shave of the hog as it ramps down to the stem to increase the angle of the keel slightly and I'm happy to report the stem fits like a glove so no botch up needed. The second pic shows the result it still needs some more work but that will wait until the planking is finished.

    Attachment 146125Attachment 146126

    Oh and a bit of jewelery along with some bronze bits arrived from Ross Lillistone (fathers day present to myself ) thanks Ross.

    Attachment 146127
    Mike
    "Working to a rigidly defined method of doubt and uncertainty"

  12. #131
    Join Date
    Mar 2007
    Location
    Adelaide
    Posts
    2,139

    Default Backbone

    The keel and skeg are complete and fitted. I got a little carried away with the keel shaping around the rear section of the CB slot. The flat surface to receive the half oval is too thin but I don't think it will matter and besides looking nice it will improve water flow to the skeg, well that's my story and I'm sticking to it.

    Attachment 146143Attachment 146144

    The pic shows I deviated a little from the plans and used lag bolts to attach the skeg instead of through bolts and nuts. Of course the question on everyone's lips at this point is did I drill the holes straight. Answer is no, after I cut out the skeg and trimmed the joint I started the tapered sides instead of leaving it square to register against a fence thus ending up with an angled drilling this even after checking the drill press table for square rechecking the alignment umpteen times. Fortunately the misalignment is only slight so no harm done.

    Attachment 146145Attachment 146146Attachment 146147
    Mike
    "Working to a rigidly defined method of doubt and uncertainty"

  13. #132
    Join Date
    Oct 2008
    Location
    Victoria
    Age
    70
    Posts
    631

    Default

    Really lovely work Mike. And great pics as well. Thanks.
    What caused the Pacific War? A book to read: here

    http://middlething.blogspot.com/

  14. #133
    Join Date
    Mar 2007
    Location
    Adelaide
    Posts
    2,139

    Default

    Quote Originally Posted by rob540 View Post
    Really lovely work Mike. And great pics as well. Thanks.
    That made me chuckle if only you knew, just came in from the shed after cutting the CB slot in the inner keel.

    Now there are many ways to do this, by hand with a rip saw and some careful chisel work a bit slow perhaps or jig/sabre saw and clean up with a pattern following router bit, a lot quicker or you could really rip into it with a circular saw and wiz along with 19mm pattern bit like I intended.

    This last method does depend on one very important factor and that is
    DO NOT FIT THE SKEG BEFOREHAND
    or the saw and router will foul on it. Obvious to any forward thinking boat builder even me, pity I didn't remember my planing now where is my pad and pencil.
    Ah well after cutting and routing as much as possible some hand tool work was needed to finish up.

    Back to planking.
    Mike
    "Working to a rigidly defined method of doubt and uncertainty"

  15. #134
    Join Date
    Mar 2007
    Location
    Adelaide
    Posts
    2,139

    Default First cut is the deepest

    I purchased a japanese flush cut saw for trimming plugs and thought it would do a good job on flushing off the keel below the transom.

    Ended up slightly under cutting the thing, kinked the saw and generally decided patience and a plane are safer to use. Just as well the rudder gudgeon brackets will cover it up.

    No pics at the moment and work is on hold for a couple of weeks while I trek north across the Simpson desert.
    The weather is a bit iffy with an inch plus of rain forecast for the area so if you don't hear from me again you can assume we did a Burke and Wills and
    a) got permanently bogged in a claypan
    b) drowned in Eyre Creek
    c) ran out of fuel and beer thus perished.
    d) all of the above

    Mike
    "Working to a rigidly defined method of doubt and uncertainty"

  16. #135
    Join Date
    Oct 2008
    Location
    Victoria
    Age
    70
    Posts
    631

    Default

    Have a great trip. I think those two gentlemen would have given a barrel of bully beef to see the country as lush as you will.
    What caused the Pacific War? A book to read: here

    http://middlething.blogspot.com/

Page 9 of 24 FirstFirst ... 456789101112131419 ... LastLast

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •