Shemarah II

[LARRY WHETTONParticipant @larrywhetton68737]

Hi Garath,

You migth try a fine spring , strechch a littel 1 left and right on a cross over bacis,

or a plated hot wire , done with all the elf and safty , sounds daft but might work ,

a pratice piece might help , well done on great detail gold medel standered,

enjoying blog , and some great in put by others………..cheers Larry….

Edited By LARRY WHETTON on 10/05/2013 20:32:31

[Gareth JonesParticipant @garethjones79649]

Hi Larry,

Thats another good idea if I can find some springs the right size. I would need left hand and right hand coil springs though to get the effect of the double 'thread' in the shaft. However wrapping a bit of thin wire around the shaft might be a possibility. I will add it to the list of suggestions,

Thanks very much for the idea,

Gareth

[Gareth JonesParticipant @garethjones79649]

Hi Larry,

Thats another good idea if I can find some springs the right size. I would need left hand and right hand coil springs though to get the effect of the double 'thread' in the shaft. However wrapping a bit of thin wire around the shaft might be a possibility. I will add it to the list of suggestions,

Thanks very much for the idea,

Gareth

[Gareth JonesParticipant @garethjones79649]

Hi Larry,

Thats another good idea if I can find some springs the right size. I would need left hand and right hand coil springs though to get the effect of the double 'thread' in the shaft. However wrapping a bit of thin wire around the shaft might be a possibility. I will add it to the list of suggestions,

Thanks very much for the idea,

Gareth

[Former MemberParticipant @formermember53987]

[This posting has been removed]

[Former MemberParticipant @formermember53987]

[This posting has been removed]

[Former MemberParticipant @formermember53987]

[This posting has been removed]

[Gareth JonesParticipant @garethjones79649]

Hi Richard,

Yet another possible solution. I will be spoilt for choice soon. I will keep my eyes open for some thin walled styrene tubing and have a go. The tube I have used so far is 1 mm thick which I suspect would be too thick to cut neatly. Thanks very much for the suggestion. This particular topic seems to have inspired more interest in Shemarah than most. I will keep you all informed with some photos when I get round to attempting to make the leadscrew.

At the moment I am trying to come up with a simplified representation of the hydraulic pipes and control valves which are mounted on the side of the winch below the hydraulic motors and gearbox. When I have the first of these prototypes assembled I plan to go back to the leadscrew.

Regards

Gareth

[Gareth JonesParticipant @garethjones79649]

Hi Richard,

Yet another possible solution. I will be spoilt for choice soon. I will keep my eyes open for some thin walled styrene tubing and have a go. The tube I have used so far is 1 mm thick which I suspect would be too thick to cut neatly. Thanks very much for the suggestion. This particular topic seems to have inspired more interest in Shemarah than most. I will keep you all informed with some photos when I get round to attempting to make the leadscrew.

At the moment I am trying to come up with a simplified representation of the hydraulic pipes and control valves which are mounted on the side of the winch below the hydraulic motors and gearbox. When I have the first of these prototypes assembled I plan to go back to the leadscrew.

Regards

Gareth

[Gareth JonesParticipant @garethjones79649]

Hi Richard,

Yet another possible solution. I will be spoilt for choice soon. I will keep my eyes open for some thin walled styrene tubing and have a go. The tube I have used so far is 1 mm thick which I suspect would be too thick to cut neatly. Thanks very much for the suggestion. This particular topic seems to have inspired more interest in Shemarah than most. I will keep you all informed with some photos when I get round to attempting to make the leadscrew.

At the moment I am trying to come up with a simplified representation of the hydraulic pipes and control valves which are mounted on the side of the winch below the hydraulic motors and gearbox. When I have the first of these prototypes assembled I plan to go back to the leadscrew.

Regards

Gareth

[LARRY WHETTONParticipant @larrywhetton68737]

Good morning Garath,

Have a look at those little flags on plastic sticks as used in jubilee events ,

sold at sae side for beach itams ,

loads are discarded in bins they are quite thin walled , or drinking straws , or roll your own using paper……….another one to add to list . i use striped cable sheathing for piping or heat shrink,

we seem to be having a master class build, have fun trying surgestions….Larry…

[LARRY WHETTONParticipant @larrywhetton68737]

Good morning Garath,

Have a look at those little flags on plastic sticks as used in jubilee events ,

sold at sae side for beach itams ,

loads are discarded in bins they are quite thin walled , or drinking straws , or roll your own using paper……….another one to add to list . i use striped cable sheathing for piping or heat shrink,

we seem to be having a master class build, have fun trying surgestions….Larry…

[Bob Abell 2Participant @bobabell2]

This is a job for an Engineer!……..Only a quality job is good enough for this application!

I`ve made an attachment that fits the lathe toolpost with a hole drilled…….dead on centreline

The material is a 4mm length of solid plastic

Not a bad start?

Using a micro tool, the drill is pushed through the guide hole and the tool slide is set to about 0.5 mm depth of cut.

Cut a groove in the plastic, to test the cutting action

So far so good!

The tricky part now is to sort out the change gears to obtain a 4mm pitch!

If things don`t work out, it ain`t for the want of trying!

Back shortly

Bob

[Bob Abell 2Participant @bobabell2]

This is a job for an Engineer!……..Only a quality job is good enough for this application!

I`ve made an attachment that fits the lathe toolpost with a hole drilled…….dead on centreline

The material is a 4mm length of solid plastic

Not a bad start?

Using a micro tool, the drill is pushed through the guide hole and the tool slide is set to about 0.5 mm depth of cut.

Cut a groove in the plastic, to test the cutting action

So far so good!

The tricky part now is to sort out the change gears to obtain a 4mm pitch!

If things don`t work out, it ain`t for the want of trying!

Back shortly

Bob

[Bob Abell 2Participant @bobabell2]

The change gears……..Not a pretty sight!

The instruction plate says the max pitch is 3mm……..Which is worth the exercise to prove the point

Fingers crossed

Bob

[Bob Abell 2Participant @bobabell2]

The change gears……..Not a pretty sight!

The instruction plate says the max pitch is 3mm……..Which is worth the exercise to prove the point

Fingers crossed

Bob

[Gareth JonesParticipant @garethjones79649]

While Bob has been beavering away on his lathe I have made up the prototype set of hydraulic pipes and valves. I need to add an operating lever on to the top of the rear block and solder the two small pipes together near the botton left hand corner. I will probably use the most battered of these pipes as patterns and make up some new tidier versions for the final installation.

As you can see from the picture, I have lost a few nuts in the process of manhandling the winch to add the pipes.

I also has a go at the leadscrew using narrow black Trimline, just wrapped round a bit of 4 mm plastic tube as an experiment. If the tube were painted a dull gunmetal colour before the Trimline was added and then the whole thing given a coat of matt varnish it would probably look better than a plain piece of tube. However I will have a look at the other ideas and see what Bob comes up with before making a decision.

Edited By Gareth Jones on 11/05/2013 14:36:13

Edited By Gareth Jones on 11/05/2013 14:36:57

[Gareth JonesParticipant @garethjones79649]

While Bob has been beavering away on his lathe I have made up the prototype set of hydraulic pipes and valves. I need to add an operating lever on to the top of the rear block and solder the two small pipes together near the botton left hand corner. I will probably use the most battered of these pipes as patterns and make up some new tidier versions for the final installation.

As you can see from the picture, I have lost a few nuts in the process of manhandling the winch to add the pipes.

I also has a go at the leadscrew using narrow black Trimline, just wrapped round a bit of 4 mm plastic tube as an experiment. If the tube were painted a dull gunmetal colour before the Trimline was added and then the whole thing given a coat of matt varnish it would probably look better than a plain piece of tube. However I will have a look at the other ideas and see what Bob comes up with before making a decision.

Edited By Gareth Jones on 11/05/2013 14:36:13

Edited By Gareth Jones on 11/05/2013 14:36:57

[Bob Abell 2Participant @bobabell2]

That`s the effect we`re after………..But at the moment, Gareth

The gearing does not come up with 3mm pitch!

Will have to wait till Monday before I can contact the factory in Chester for their advice

In the meantime, I`ll have another look at it

Bob

[Bob Abell 2Participant @bobabell2]

That`s the effect we`re after………..But at the moment, Gareth

The gearing does not come up with 3mm pitch!

Will have to wait till Monday before I can contact the factory in Chester for their advice

In the meantime, I`ll have another look at it

Bob

[Bob Abell 2Participant @bobabell2]

Sorted the gearing out

Now got 3mm pitch which is the lathes max

The process wan`t bad, but dril wander and backlash prevented a clean cut

I think 3mm pitch is too small?

Now that the thread is formed, I could try tickling it with a fine file

Bob

[Bob Abell 2Participant @bobabell2]

Sorted the gearing out

Now got 3mm pitch which is the lathes max

The process wan`t bad, but dril wander and backlash prevented a clean cut

I think 3mm pitch is too small?

Now that the thread is formed, I could try tickling it with a fine file

Bob

[Bob Abell 2Participant @bobabell2]

Managed to create 5mm pitch

But soon discovered, the lathe won`t cut left hand threads!

We were nearly there too!

The end of the line, Gareth!

Bob

[Bob Abell 2Participant @bobabell2]

Managed to create 5mm pitch

But soon discovered, the lathe won`t cut left hand threads!

We were nearly there too!

The end of the line, Gareth!

Bob

[Gareth JonesParticipant @garethjones79649]

Hi Bob,

Its a good attempt and a very ingenious way to make the lead screw. However I think the pitch of the thread does need to be around 4 mm or by the time the second, opposite hand thread groove has been cut, the lands between the grooves will be too small. I think the Trimline method looks crisper and neater, even though it does not actually have a groove in the shaft.

I am going to start making the first 'production' winch tomorrow. There are a number of changes to make from the prototype including a bigger diameter for the area where the wire is wrapped around the drum and a more 'sculpted' look for the hydraulic motors and gearbox. The existing simple sharp edged discs used for the motors and gearbox look a little oversimplified.

I will make up a new leadscrew and paint it before wrapping the Trimline on and then varnishing it tomorrow. Watch this space over the next couple of days.

Gareth

Edited By Gareth Jones on 11/05/2013 17:40:26

Edited By Gareth Jones on 11/05/2013 17:41:05

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