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Elevating stand for my new thicknesser

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Elevating stand for my new thicknesser

Postby 9fingers » 22 Jan 2016, 22:23

I showed some early photos of my current thicknesser storage stand here http://www.thewoodhaven2.co.uk/viewtopi ... ser#p19206

It currently stores/supports a DW733 mk1 lunchbox planer. the planer is flipped over and stored upside down and the stand rolls under the bench out of the way when not used.
I estimate the planer might weigh about 30 kgs and I used a pair of gas springs to help counterbalance the weight whilst flipping it.

My new thicknesser is a heavy beast possibly over 200kg and I'm not confident that I can safely counterbalance this sort of weight to use the same method.
After a bit of thinking I've come up with an elevating stand where the planer will drop down from the operating position by around 550mm into the stand and so be able to be rolled under the bench out of the way.

I've made a whole load of measurements of critical dimensions and a number of 2D drawings of key regions but the rest of the stand is still between my ears until today when I took the sketchup challenge to sketch what I plan to make and help to explain it to you.


This is the basic stand housing.
Image

It is a box made from 18mm MRMDF with the joints set into 2mm deep dados.
The 4 dark grey strips are the outer part of full extension drawer slides - the rest of the mechanism is not used but returned to the project box for another day.

These strips are the guides to make sure the platform that carries the thicknesser (not shown) can rise and fall smoothly and not rack side to side or front to back.

Image

This is the block that will run inside the strips. it is a block of aluminium fitted with 6 miniature ball races
5mm wide, 14mm diameter and 5mm bore.

I've tried to show it fitted in the strip in this photo.

Image

Back to sketchup, this shows the 4 jack screws in red that will lift the platform up and down.

Image

At the bottom of each jack screw is a bearing to take the thrust ( at least 50kg per jack)

Image

Immediately below these bearing blocks are heavy duty casters transmitting the load direct to the floor.

The jackscrews are lengths of threaded rod with an acme thread (4mm pitch - one turn lifts 4mm). This is the type of thread found on quality clamps and designed for heavy loads. Matching bronze nuts offer lower friction in combination with the steel as well as minimal wear and good strength.

Image

The next sketchup figure shows the guide blocks in the strips at the approx upper end of the travel.


Image



This is a s far as I've got with sketchup. What is not shown is a sprocket at the base of each jack screw and the roller chain that will connect them. Also not shown are the bronze nuts which will be bolted to the lifting platform and the guide blocks
I have a motor from an electric golf caddy that I hope to use to drive the chain but that needs experimentation once the mechanism is working.

The key to the design is that the load is transmitted direct to the floor with metal components and the mdf box does little more than keep the load vertically over the wheels and stop the machine from moving laterally.

Thanks for looking.

Bob
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Re: Elevating stand for my new thicknesser

Postby Mike G » 22 Jan 2016, 22:39

Are you going to have some sort of bicycle chain arrangement for turning all the threaded rods at the same speed and time?
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Re: Elevating stand for my new thicknesser

Postby 9fingers » 22 Jan 2016, 22:52

Mike G wrote:Are you going to have some sort of bicycle chain arrangement for turning all the threaded rods at the same speed and time?



Yes - as outlined in the text below the last picture.

Bob
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Re: Elevating stand for my new thicknesser

Postby Mike G » 22 Jan 2016, 23:05

I just knew that would happen! :D How did I miss that......
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Re: Elevating stand for my new thicknesser

Postby 9fingers » 22 Jan 2016, 23:10

Mike G wrote:I just knew that would happen! :D How did I miss that......


No worries Mike. You had me going for a bit as I thought I had left that part out. This design has been buzzing round in my head for a while now and it is easy to think that something has been said or done when instead I've just thought about it. Worst time is when I wake in the night with a minor "eureka moment" over some issue or other and forget to add it to the drawings in the morning.

I guess you may have similar things happening with the house build or indeed the propeller project.

Bob
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Re: Elevating stand for my new thicknesser

Postby Mike G » 22 Jan 2016, 23:15

It happened most often with an invention I patented in SA a couple or 3 years ago. Minor parts needed a disproportionate amount of thought and design input.
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Re: Elevating stand for my new thicknesser

Postby 9fingers » 22 Jan 2016, 23:19

Another photo I forgot to publish showing some of the kit of parts, some bought in, some home made.

Image

Bob
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Re: Elevating stand for my new thicknesser

Postby DaveL » 23 Jan 2016, 00:26

I think that will work OK. It's a bigger version of how the thicknesser bed rises and falls in my Axminster Perform planner thicknesser.
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Re: Elevating stand for my new thicknesser

Postby Phil » 23 Jan 2016, 05:48

DaveL wrote:I think that will work OK. It's a bigger version of how the thicknesser bed rises and falls in my Axminster Perform planner thicknesser.


The Elektra Bekhum works the same.

Bob, some very nice machining and a very good idea.

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Re: Elevating stand for my new thicknesser

Postby Andyp » 23 Jan 2016, 09:17

Brilliant. I expect that t will voice activated too :D
I do not think therefore I do not am.

cheers
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Re: Elevating stand for my new thicknesser

Postby TrimTheKing » 24 Jan 2016, 09:53

Woohoo I do love a good engineering thread (no pun intended :D)

Cheers
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Re: Elevating stand for my new thicknesser

Postby tracerman » 24 Jan 2016, 21:39

Bob - wonderfully conceived , and beautifully executed .

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Re: Elevating stand for my new thicknesser

Postby 9fingers » 24 Jan 2016, 21:52

Thanks Steve,

Lots more work to go yet but I'm hopeful of success. A few more design details thrashed out today, parts ordered and some more metal to machine in the morning.

Bob
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Re: Elevating stand for my new thicknesser

Postby Wizard9999 » 24 Jan 2016, 23:52

Looking very good so far Bob, will be watching with interest. Though I am a bit worried that this is distracting you from those bookcases ;) .

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Re: Elevating stand for my new thicknesser

Postby 9fingers » 25 Jan 2016, 04:41

Wizard9999 wrote:Looking very good so far Bob, will be watching with interest. Though I am a bit worried that this is distracting you from those bookcases ;) .

Terry.


ISTR that you were interested in the lift method so glad you have spotted the thread. You should not concern yourself over bookcase progress as machining the parts for the lift is a useful fill in job whilst waiting for finish stages on the bookcases batch to dry. The wood workshop needs to be kept as free as possible from air borne dust during these latter phases so retiring to the metal workshop is ideal.

Bob
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Re: Elevating stand for my new thicknesser

Postby Wizard9999 » 25 Jan 2016, 09:41

9fingers wrote:
Wizard9999 wrote:Looking very good so far Bob, will be watching with interest. Though I am a bit worried that this is distracting you from those bookcases ;) .

Terry.


ISTR that you were interested in the lift method so glad you have spotted the thread. You should not concern yourself over bookcase progress as machining the parts for the lift is a useful fill in job whilst waiting for finish stages on the bookcases batch to dry. The wood workshop needs to be kept as free as possible from air borne dust during these latter phases so retiring to the metal workshop is ideal.

Bob


Looks like you are burning the midnight oil Bob! Should have guessed there was perfect synergy, I remember you advocating lists of different types of jobs so they can be fitted together.

Forgive my stupidity, but what does "ISTR" mean?

Terry.

Edit: does it mean "I Seem To Recall", just had a rare moment of inspiration :lol: .
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Re: Elevating stand for my new thicknesser

Postby 9fingers » 25 Jan 2016, 09:47

ISTR = I seem to recall

I could not sleep last night so went downstairs and fiddled about on the PC for an hour or so.

Bob
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Re: Elevating stand for my new thicknesser

Postby Commander » 29 Jan 2016, 16:50

Looks brilliant so far Bob! I'm excited to see this one come together!
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Re: Elevating stand for my new thicknesser

Postby 9fingers » 29 Jan 2016, 17:42

Commander wrote:Looks brilliant so far Bob! I'm excited to see this one come together!



Thanks Erich. I hope to get some more workshop time over the weekend and maybe some more parts ready to photograph.

The acid test is a while down the road yet to see if the motor and gearbox I have from the golf cart is man enough to lift the machine. The fall back option is to go "dumpster diving" at a nearby place that refurbishes wheel chairs for more powerful motor/gearbox combinations.

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Re: Elevating stand for my new thicknesser

Postby 9fingers » 01 Feb 2016, 20:26

A few things got in the way over the weekend so it was not until this afternoon I got into the metal workshop.

I had already made some fittings for the lower end of the jackscrews. These have a spigot on the end to sit into the thrust bearing and a bore about 25mm deep to receive the end of the threaded screws.

Two M6 bolts secure the end of the screw into the end fitting and the sprocket to that.

Image

As mentioned earlier the thrust bearing carrier transfers the load to the caster.

The photo show this as fitted to the jack screw/sprocket assembly.

Image

The next photo is a mock-up of two of the four jackscrews in a piece of aluminium channel (to stiffen the structure against the chain tension).

Image

In the centre of the channel is a block with a pair of idler sprockets. These are mounted on hardened steel shoulder bolts and have needle roller bearings in the sprockets.

Image

The next photo show a short piece of chain on the sprockets. A longer version of the loop of chain will have another sprocket on the driving motor.

Image

Hopefully this diagram of the chain path might help clarify the set up

Image

Thanks for looking

Bob
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Re: Elevating stand for my new thicknesser

Postby DaveL » 01 Feb 2016, 22:44

Looking good, waiting to the test results.
Regards,
Dave
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Re: Elevating stand for my new thicknesser

Postby 9fingers » 01 Feb 2016, 23:01

DaveL wrote:Looking good, waiting to the test results.



Me too Dave! According to SWMBO, currently I have to make significant progress on the bookcase varnishing before I can dare make any fresh dust in the wood workshop.
Might be a couple of weeks?
Bob
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Re: Elevating stand for my new thicknesser

Postby Wizard9999 » 02 Feb 2016, 10:05

9fingers wrote:
DaveL wrote:Looking good, waiting to the test results.



Me too Dave! According to SWMBO, currently I have to make significant progress on the bookcase varnishing before I can dare make any fresh dust in the wood workshop.
Might be a couple of weeks?
Bob


I can see where your other half is coming from Bob, keen to see those bookcases finished...

...but this is also looking jolly interesting.

So if you wouldn't mind cracking on and getting both moved along :lol: .

Terry.
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Re: Elevating stand for my new thicknesser

Postby 9fingers » 02 Feb 2016, 10:19

Wizard9999 wrote:
9fingers wrote:
DaveL wrote:Looking good, waiting to the test results.



Me too Dave! According to SWMBO, currently I have to make significant progress on the bookcase varnishing before I can dare make any fresh dust in the wood workshop.
Might be a couple of weeks?
Bob


I can see where your other half is coming from Bob, keen to see those bookcases finished...

...but this is also looking jolly interesting.

So if you wouldn't mind cracking on and getting both moved along :lol: .

Terry.


I share your need for joint project progress. I would help if SWMBO had not organised a lunch out with her friends today and if people stopped ordering inverters from me etc but I'll be doing my best!
Still one bit of good news is that my mates CNC is back up and running with new parts so hopefully no more call outs there for a little while.

I'll just finish this cup of coffee and I'll be back in the workshop wielding sandpaper and varnish brush in 10 minutes.

Bob
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Re: Elevating stand for my new thicknesser

Postby Andyp » 02 Feb 2016, 12:08

Me thinks you need an apprentice Bob :D
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