edi malinaric

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About edi malinaric

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  • Birthday 07/24/39

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    Cape Town

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  1. How did these cracks occur, and how should they be treated?

    Thank you Stavanger - iirc that year the winter was cold and the snow was 2m deep. Lots of time to do such work. Very nice. The grain in the back is also stunning. cheers edi
  2. How did these cracks occur, and how should they be treated?

    Hi Stavanger - how about some pictures of the artwork? Looks interesting. cheers edi
  3. Sanders

    Hi Nick and Mark, I've used compressed air to pop off fibreglas from moulds, the rolling foot technique work beautifully - softens the rubber and re-centres everything - quick too. Good call on spoiling the drill press quill - maybe I should and take an oscillating sander to pieces first and see how it's put together. cheers edi
  4. Sanders

    Hi All - On using drill press mounted sanding bobbins... i) Christopher Jacoby wrote " Pro tip-- throw the spindles in the freezer when it's time to swap the sleeves out." It's quicker to slacken off the expanding nut, drop the bobbin on the floor and roll it backwards and forwards with your foot. ii) it pays to adjust the sander in the drill press for minimum run-out. Maybe it's from setting up work in a lathe - I have found it no trouble to get these things to run quite true. iii) I did turn up an aluminium holder that used two o-rings to supply the clamping force. Decided that it was a wasted effort as the drill chuck didn't run true and you still had to fiddle with it. iv) still toying with fitting a sewing machine motor and crank to a spare drill press and make it into an oscillating sander. However wiping the sander clean with one of those plastic "rubbers" before things clog up, works just fine. cheers edi
  5. Bow - Cracks in Head

    H Bengreen - just to make the suggestions unanimous - acetone or MEK wash and instant glue. In 1964 my cello bow developed a crack that started high up on the left hand side of the tip and ran at an angle towards the centreline. Being a freshly graduated engineer I carefully watched this slow motion development of a stress failure - thinking that within a short time I would be faced with buying a new bow. The crack slowly grew longer - my daily inspections covered weeks, months, years and eventually decades. Finally the crack could be seen to move when squeezed and an almost retired engineer yielded to an urge of "Fix-It". A couple of drops of MEK to flush the surfaces of the crack, a blast from a hair dryer to remove all traces of the MEK and a drop of super glue massaged into the crack and then held tight for a count of 60. The following day I carefully removed the surface excess and buffed up the tip. The repair has been holding for the last 17 or so years - so this now-ancient engineer can report that it is also a well tested repair routine. Go for it. cheers edi
  6. Fires and Feelings!

    Hi All Mountain fire No 6 heading our way.- the reward for starting this topic? This pic is from my balcony looking NNE. The road to Cape Town has been closed since 16h30. I suspect we'll have some flame pics later this evening. That copse of trees on the far slopes above the road cutting are 15 - 20m tall Bluegums. Hope we don't lose them. Once again the wind is too strong for the helicopters to fly - we aren't called the Cape of Storms for now't. Report from Santa Rosa - fires are flaring up again and Dave and Sharon's house is once again close to the "firing line" I don't think that a pic of our approaching little problem would cheer them up cheers edi
  7. Fires and Feelings!

    Hi All - my wife's cousin lives just outside Santa Rosa. They were evacuated, the surrounding neighbourhood has been devastated. We are worrying for them from facebook entry to facebook entry. As of last night their house still stands. My thoughts go out to all who face fire - especially members of our community. Seven months ago - almost to the day - we faced a similar situation - so I can relate to their fears and the feeling of helplessness as the heat relentlessly approaches. What to pack - when to run - where to run - what if it all goes up in flames - can one recover a lifetime of ... what? Our house is in the second highest row of houses just over the ridge. When the smoke first started streaming over the neck on the other side of that peak, Rose and i drove to Hout Bay to check a friend's property on the south-east side of that peak (the pic is looking to the south west. A tunnel through that peak would speed things up). The fire had burnt fairly high up on the slopes and had burnt past his house and - HORRORS - the strong wind that kept the helicopters grounded, was driving the flames through the neck onto our side! We screamed back to Llandudno - to turn the corner and see the above. We collected on the streets meeting neighbours and worrying all through the afternoon and into the night as the fire advanced. Fortunately, with sunset, the wind dropped and died away and the fire-fighters on the ground managed to contain things. That was our fifth mountain fire. You never get used to the feeling of absolute helplessness - and as you get older, things get worse. Fires of 30 years ago found me up on the slopes actively doing something - beating, shovelling, helping the forestry guys start counter-fires. Now - approaching 80 - I realise that I can only run away! Hell - even running is beyond me. Our thoughts are with all. cheers edi
  8. Cruel - why would one want to drive the the lions towards extinction? cheers edi
  9. Hi Bill - I wonder if there's any correlation with the increase in global temperatures - reducing the need for bonfires for warmth? cheers edi
  10. Mmm - don't know about the violin. If less than abysmal makes it a dog of a violin maybe it should be called a Cerberus. Of course that implies that the bow would be called a Styx. cheers edi
  11. Violin for id

    Hi Jacob - it's a bummer. Just take it "one small step" at a time. cheers edi
  12. Carminic Acid extraction from ci75470

    Hi Michael - using the posted equation, together with the values from Jim - we have G-force = 932 of those pesky "critturs"! Everything we always wanted to know. My second car was a little Fiat Cinquecento - a bit of inlet porting, exhaust pipework, a crankcase breather and I could wind it up to 6000 rpm (+ little bit over - depending on the a steepness of the hill and the strength of the gale from behind.) This engine was fitted with a simplest of simple centrifugal oil filters bolted to the nose of the crankshaft. At max revs it subjected the oil to ~ 3000 G. The oil always looked remarkably clean while crank journal and cylinder bore wear were neglible. For our purposes (varnish) I might cobble up something similar - but mounting the filter with its axis vertical. One would pour the raw fluid down through the centre hole, then, after some suitable time, stop the rotation and drain the filtrate out through a valve at the bottom. Finally undo the bolts to split the centrifuge and clean out the precipitate ("the cake"). cheers edi
  13. Carminic Acid extraction from ci75470

    Hi Jim - relying on memory - let's not go there shall we. Two - three days ago I was chatting with Franco (a fellow mech. engineer from the Class of 1957) and both of us trying to remember what name was given to in-line gear teeth on a shaft. We both were getting a little desperate when I blurted "Splines!" . Franco heaved a huge sigh of relief and quipped "Thank goodness I still know what the name means" OK - if you give me a radius I'll report back :-) cheers edi
  14. Salute to the humble 102

    Mmm - Fingal's Cave? Finlandia? The Trout? Der Moldau? - and from my part of the world* - The Flying Dutchman! * The Cape of Storms cheers edi
  15. Carminic Acid extraction from ci75470

    Hi Jim - what sort of G/time are we taking about. cheers edi