Monday, July 27, 2015

A Lazy Kate to go with Orla

As you can expect when you acquire nine new spinning wheel Bobbins you need somewhere to store them. These where made for Orla.

So some more English Oak was sourced this time from Boutique Timbers a nice plank/board some 2m x 250mm x 55mm, always best to have more wood than you really need.

The idea was to store as neat and practical as possible the two different sized series of Bobbins six small, three larger.
Of course the need to use the whole lot at once would be rare well for some maybe, I envision that will not be the case for Sue however.

The design came to mind for a two tier with the top being able to rotate to allow access to the lower set, but ability to remove if need be.

I Turned up two platters, one 9" dia x 1" thick and one 7" dia x 3/4" thick, gave some shape to the top sides so the bobbins would sit a little high off the running area when they turn.
Marked out the top piece to be a tri-arm for the three larger bobbins with cut outs allowing access to the lower bobbins. This was cut using the scrollsaw and shaped and sanded.

I turned up a brass bush for the top section to rotate on and use of a lock pin to allow both to be one yet still rotate.

 Machining the brass bush.
19mm inner dia, 22mm out dia. large face section 30mm. 2mm bearing area thickness.

 Below the bush in place on the top section prior being cut to shape.. Three holes drilled for the bobbin supports which are 1/4" Gal rod.

Below dry fit up of the base plate and both in right photo.

 Below a view of the brass bush.

Below the top platter now cut to shape and further dry fit. Left with Gal rods dry fitted and a Bobbin showing the height.

 Lower base setion with Gal rods fitted and glued in place. Clean up was just a removal of excess epoxy using a chisel. The hole in the upper shaft is the lock pin hole.

 Below a view after final assembly.

  Almost full stocked one Bobbin is on Orla the spinning wheel.

 Lock pin in place the top section rotates on the brass bush.

Sweet Treats

Sue has been busy in bulk.

Friends and neighbours gave Sue some of their crop of Oranges, Lemons and Sue's long term friends brother passed on some of his Cumquat crop 3.5kg.

In a park near by council had planted a Lilli Pilli which has bared fruit also our two grandsons Christian and Brodie help Nana pick about 4kg.

Sue made 11 jars of Lilli Pilli jam which has been already seen me enjoy some of that for breakfast on my toast.

There were 14 jars of Cumquat Marmalade which used only half the 3.5kg of fruit.

Thats when Sue found she only had a few jars left to use, she had run out so has put a call out to any who can help supply metal sealed lidded jars, the type used on jams etc.

The Oranges were used and made just a small amount of Marmalade which was handed back to those who supplied the fruit and a couple of others.

Some of the Lemons have been preserved in another form Sue uses that to add to cooking and cakes.

Tuesday, June 30, 2015

A 4 jaw Wood Chuck Modification

When I was still with the Ornamental Turners group I was on the look out for a Independent 4 Jaw chuck often discarded by wood turners off old or cheaper lathes. David Laird and Darrell Smith picked one up from out Mudgee way,  that was some 4 years ago.
The chuck had a 3/4" 19mm bore - spindle thread which wouldn't fit any lathe I had, I had arranged to have it drilled and tapped to 1"x10 to fit the Jet mini spindle but Tim moved to greener pastures.

The 4 jaw chuck as it was prior machining and new washers.

Rear of the chuck showing original washers which were to small.

Below the jaw lead screw.

Now I have the Myford ML7 I had the opportunity to do this myself.

After removing the jaws of the wood chuck I mounted the chuck off the rear spindle shaft in the 3 jaw chuck on the Myford to check balance and run out.

Above and Left mounted in the 3 jaw chuck.

Right a spray with WD40 and a clean up.

My first mistake was just doing this visually, my second mistake was then mounting it in the 4 jaw chuck with the face to the headstock.
Having not checked run out using a dial gauge when it was mounted in the 3 jaw where I should have just drilled and tapped the bore using the 3 jaw chuck then checked run out again.

Lesson learnt.

Below I bored an area or 5mm to allow a clear shoulder.

  Right showing the clearance of the jaws to the bed of he lathe.

Once the bore was drilled and tapped 1"x10 I was able to fit it to the Jet mini Variable speed lathe I have......well I thought so. Seems the Jet spindle thread was tapered to the headstock and hardened, Ken came to my rescue we tried using my 1"x10 die to cut the thread but as it was hardened it only cleaned the thread or removed very little. Ken used a diamond file to deepen the pitch and used an adjustable reamer to remove some thread peak in the bore of the chuck. That worked, we got it to screw up tight to the shoulder.

Test fitting to the Jet.

Below parting a washer.

Thats when as I increased RPM to over 1100 I noticed a vibration much like when a car wheel has lost a balance weight, go above 1500 rpm and it ran smooth again.
All this testing was done without the jaws fitted. I used a dial gauge to check run out I got a .005 thou reading on the face in two areas, and a .007 on two way sections where the jaws run. The ways obviously had not been machined at all as the sand casting impression was not machined.

I re-mounted the 4 jaw chuck into the 3 jaw Myford chuck and machined the face (yes I checked run out first it matched that of the run out on the Jet Mini).
I also machined the out edge which wasn't square to the face even prior machining.
I used a file to level the ways (one day I'll learn to hand scrape) the filing proved positive.

 In remounting the 4 jaw to the Jet Mini it ran much better but still the vibration was there at around 1350 RPM to 1500 RPM so an improvement. In considering machining the webbing area of the back of the chuck which of course is cast iron, I can machine the ways and inner rim but the rough cast area is something else if thats where the vibration is coming from. Even with the jaws fitted and new washers little change was made.

Ken suggested it may be the bearing of the Jet Mini checking using the Nova chuck shows no vibration.

My use of the chuck is more for surface decoration of turned items not as a high speed/RPM chuck. So my work RPM will generally be below the vibration area.

I will look further for the problem but my hunch is the casting itself.

The finished chuck with jaws mounted. I have a Chuck key to make I will be using a 3/8" extension bar of a socket set weld a T bar to it.

Microwaving English Oak Turning Blanks

A friend Pat contacted me to say he was slicing up some English Oak and would I like some?
Straight away all I could thing about was another spinning wheel being made. I soon put that thought out of mind.
Sue had mentioned she required a medium size Mortise n Pestle, she had spotted one Jamie Oliver uses which appears to be a laminated English Oak, just the size she was after.
A 6" Cube would do nicely thanks Pat!

Thanks to Alan for picking the very wet 400x250 log up at the Sydney wood show it must have weighed close to 10k's wet. Dragging that from the pavilion to the car park poor old fellow.........of course along with his purchases and back pack full.

I sliced and diced it to workable size, getting two 6" dia x 6" high blanks as well as two 400x50mm spindle blanks ideal for a pair of candle sticks or light columns.
A number of spalted pen blanks and a couple of small bowl blanks  4"sq x 2" h.

Of course still all wringing wet, so the old shed microwave got a work out.
The two Mortise blanks of 6 x 6 got a total of 12 mins bring the moisture content down to 25% (I bought an Workzone Digtal moisture metre only one left).

The microwave was set to high, set for 6 min total but I only allowed 3 min period with intervals where I would open the door to allow the steam to condense and check the process of temperature increase.Allowed to rest overnight and a second session done the following day.

The two 400x50 mm pieces got a total of 9 min at 2 min intervals. The pen blanks all together at once got about 8 min at 1 min intervals.

The pith or heart area already had some checking it only became slightly worse after being in the microwave and after a week no further movement has been noticed.

 Above the pen blanks
Right the 400x50mm peices

 Two of the odd size pieces destined for other use.

Below in the left side of the microwave is moisture puddle from the blanks this was wiped up.
Right is the large piece showing the checking.

Below one of the 6" blanks and the checking - splitting this should be turned away easily enough.

 Below the other 6" blank.

 As with food a Microwave cooks from the inside out and caution should be of over length/period/time and temp at which the timber is submitted for.
I have seen the results of a Camphor blank approx 6" x 6" scorched black in the centre emitting smoke but outside still normal in appearance. The fellow burnt his hands when lifting the piece out.

I had considered using paper bags but the size I required i had none large enough. The paper bag reduces the speed at which moisture evaporates.