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  1. Well, partial success ;-)

    I did do a trial pour of the pattern on Wednesday. There is good news and some bad news as well.

    The good news is that the runner system seems to work well and the mold filled fully(until it...
  2. Just a brief note but, for me, an important one....

    Just a brief note but, for me, an important one. I was able to ram up and cleanly pull the 48"pattern today. Whew---it took every bit of concentration and care I could muster. I was worried I might...
  3. Here is the runner pattern I will try with this...

    Here is the runner pattern I will try with this SE pattern. It is similar to the one I used with the 36. But, that does not necessarily mean it will work for this pattern. BTW, it looks like this...
  4. The pattern is ready to ram up in green sand....

    The pattern is ready to ram up in green sand. Hopefully, that can happen tomorrow and if the weather is reasonable I can do a trial pour. I don’t expect the first (few) pour(s) to result in a usable...
  5. Today's shop time was spent mostly making flasks...

    Today's shop time was spent mostly making flasks to accomodate the new patterns. The inside length is 54" and width 13" with the drag being 4.5" deep and the cope 3.5". I started out making them from...
  6. Interesting idea. What do you suppose the cost...

    Interesting idea. What do you suppose the cost of a block of 6061, appropriate end mills, CAD and machine time might be? BTW the front and back of the pattern are not the same as the bow is...
  7. I have spent the last couple days builidng larger...

    I have spent the last couple days builidng larger flasks to fit the larger pattern to make the needed casting molds and doing finish work on the pattern. A detailed pattern like this one has to be...
  8. My suggestion is for anyone wishing to address...

    My suggestion is for anyone wishing to address this “behavior” rather than muddy up a thread that has been intended to be informative and perhaps even interesting, that they start a separate thread...
  9. I will post up a little more work done today by...

    I will post up a little more work done today by descriptiuon rather than pics which would be difficult to make for this work anyway.

    Here is an update of today's progress. I got the back ribs...
  10. Well, my Featherweight 48 is coming along very...

    Well, my Featherweight 48 is coming along very nicely. Today I had to take a step I had been anticipating and I realized could go well or could result in more or less disaster. After gluing up the...
  11. Replies
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    JST, I have several 36’s in stock. I sell them as...

    JST, I have several 36’s in stock. I sell them as raw castings and machined castings and have listed them on eBay.

    36" Lightweight Cast Iron Camelback Straight Edge Featherweight Raw Casting |...
  12. Sure, it is pretty common to use aluminum for a...

    Sure, it is pretty common to use aluminum for a working pattern. And if I were sending my work out, I would have to use a metal pattern as foundries are not known for their gentle handling of...
  13. Three more pics. the little tool-kmakers vise...

    Three more pics.

    the little tool-kmakers vise and cyano glue are handy for this job.

    263826

    263827
    By the way, Lucky&, I thought you had a good idea about leaving the end ribs extra thick. ...
  14. Some more progress as all front ri bs are...

    Some more progress as all front ri bs are contoured fitted an now have "cheeks" glued on to provide draft. I ended up using yellow cedar (a beatiful aromatic wood with extremely fine grain and...
  15. 263623 I did get out into the shop for a...

    263623


    I did get out into the shop for a couple hours to use the French curves and a little squinting to establish fair curves on the front side of the uprights. I think I am happy with the...
  16. I very much appreciate the FEA offer. But, I have...

    I very much appreciate the FEA offer. But, I have no CAD files for the pattern. The only files I have are graphite and paper sketches!

    I think my 18” SE is the one I have intended for use as a...
  17. Thanks for the suggestion. I am sort of curious,...

    Thanks for the suggestion. I am sort of curious, but figure you’d have to invest 50 hours or more learning time to start to understand how to use it. Maybe that is not true. Then there is the...
  18. I do not have a lot of building progress to post...

    I do not have a lot of building progress to post today as yesterday was busy with grand kids ands boxing up and shipping a straight edge. I did check the bow for squareness and it is spot-on the...
  19. I really had not considered a level.pad, but...

    I really had not considered a level.pad, but maybe I should. I do not think I could add such a pad to the bow since the bow sits off-center fore and aft. This location is intentional to allow the...
  20. 48” Featherweight Camelback Straightedge Pattern is Taking Shape.

    Double post deleted.
  21. Now the bow is glued to the web. I cut a groove...

    Now the bow is glued to the web. I cut a groove into the bow to center it on the web and then cut draft on the grooved bottom of the bow. Now the trick was to glue the bow so that its undrafted...
  22. Paul, The short answer is “no.” I do not doubt...

    Paul, The short answer is “no.” I do not doubt that my design is not the perfect solution to making a better straight edge that is lighter in weight and as stiffer than necessary to do its job. ...
  23. Now all the cutouts are routed. I used the...

    Now all the cutouts are routed. I used the template I have been showing along with a good-sized router and a flush-trim bit. That step is always a bit nervous-making as the router can potentially...
  24. Now cutting the curve for the bow using a...

    Now cutting the curve for the bow using a 100-year-old Stanley compass plane. Not a plane that I use often, but the plane perfect for the job. The curve cut is "automatically" smooth and fair in...
  25. Good idea and already planned. Doing so will also...

    Good idea and already planned. Doing so will also provide a place on the pattern to insert draw spikes to aid in pulling the pattern from the green sand. On the 36 I had to add bosses to the ends...
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