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  #601  
Old Wed 02 May 2012, 23:02
kaartman
Just call me: Koning #20
 
Abu Dhabi
United Arab Emirates
Baie baie mooi, one of kind... I like that
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  #602  
Old Wed 02 May 2012, 23:55
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Doesn't it fall over easily to the right hand side?
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  #603  
Old Thu 03 May 2012, 09:34
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
No, Gerald it is stable but the floor is not level.I will however change the design a little for the next one.I did make slots for the legs into the table top so that basically keeps the table together.
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  #604  
Old Mon 07 May 2012, 13:08
Kobus_Joubert
Just call me: Kobus #6
 
Riversdale Western Cape
South Africa
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Nice, I was out of circulation for a week and only now catching up with all the news on the forum.
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  #605  
Old Mon 07 May 2012, 13:35
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
Ja, been visiting all over the country.Show some pic`s
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  #606  
Old Tue 08 May 2012, 01:04
Kobus_Joubert
Just call me: Kobus #6
 
Riversdale Western Cape
South Africa
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Will post a picture of your wife
Pictures are all on Facebook. 4000 km in a week around South Africa
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  #607  
Old Tue 08 May 2012, 01:28
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
Ja, you can`t come and get a broom but you can stop and visit my wife in plett
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  #608  
Old Tue 08 May 2012, 01:29
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
I am not on your Fleisbook friend list.
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  #609  
Old Wed 22 August 2012, 11:15
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
My new z-slide

I decided to build a new z-slide for my MM and this is the results.I basically used what I had.The parts were made by the old z-slide before it got a new home.I will put pic`s of the unit fitted tomorrow.It slides like a dream and the gas shock works good.
Attached Images
File Type: jpg mproject 003 a.jpg (18.9 KB, 661 views)
File Type: jpg mproject 004a.jpg (19.2 KB, 665 views)
File Type: jpg mproject 005a.jpg (16.4 KB, 663 views)
File Type: jpg mproject 006a.jpg (18.2 KB, 661 views)
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  #610  
Old Wed 22 August 2012, 11:23
domino11
Just call me: Heath
 
Cornwall, Ontario
Canada
Hennie,
So why the change in design? Looks interesting though.
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  #611  
Old Wed 22 August 2012, 11:48
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
Heath, because I got board. No, just joking I basically designed it for my smaller machine and the thought is that if I can make it a universal design it could work with what I am ding next My lathe but on the lathe it will be horizontal and not vertical as in the MM. I can then use it without the gas shock.
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  #612  
Old Wed 22 August 2012, 14:31
Alan_c
Just call me: Alan (#11)
 
Cape Town (Western Cape)
South Africa
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Lekker! - how much it costs???
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  #613  
Old Wed 22 August 2012, 21:17
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
Alan I had the alu plate 12 mm that cost me R 2500.00 about 5 years ago.The bearings and rail was about R3 000.00. I can still make 2 more out of the alu plate that I have left so roughly R 4000.00 incl the rack( off cut ) and bolts.
Because the motor sits in the middle of the slide i made the part that holds the router/spindle only 400 mm long.I can move the whole thing 50 mm higher or lower if I need to. I would like to get it sandblasted before I put it back in the MM but I need to get it working so we know it is not going to happen.
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  #614  
Old Thu 23 August 2012, 00:14
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
my sexy Z-slide

Ok here is the pic`s.And it works like a dream.Now for the dust extraction
Attached Images
File Type: jpg mproject 007a.jpg (13.8 KB, 655 views)
File Type: jpg mproject 008a.jpg (15.0 KB, 655 views)
File Type: jpg mproject 009a.jpg (17.0 KB, 659 views)
File Type: jpg mproject 010a.jpg (14.8 KB, 658 views)
File Type: jpg mproject 011a.jpg (16.3 KB, 658 views)
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  #615  
Old Thu 23 August 2012, 00:16
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
some more pic`s

Some more pic`s
Attached Images
File Type: jpg mproject 012a.jpg (13.6 KB, 659 views)
File Type: jpg mproject 013a.jpg (13.3 KB, 659 views)
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  #616  
Old Thu 23 August 2012, 04:21
Alan_c
Just call me: Alan (#11)
 
Cape Town (Western Cape)
South Africa
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Is the motor spring loaded into the rack or is it fixed in place? - if fixed how do you deal with the backlash?
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  #617  
Old Thu 23 August 2012, 05:22
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
Alan it is fixed but I also thought of that.The rack has a plastic spacer so if by chance it does have any kickback it moves the rack and then I just need to move it back against the Pinion.
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  #618  
Old Thu 23 August 2012, 06:20
MariusL
Just call me: Marius #22
 
Centurion
South Africa
Hennie,
It is not kickback that you should worry about but rather backlash. If you dont have a pre-loaded tension on the rack you cannot hope to operate without backlash.
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  #619  
Old Thu 23 August 2012, 07:22
KenC
Just call me: Ken
 
Klang
Malaysia
I tried similar approach with my 1st Z-slide, I learnt that square rails has higher stiction. I have loose step issue due to rail binding when I tension the rack & pinion mesh....

Hence my current ball screw set up.
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  #620  
Old Thu 23 August 2012, 08:59
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
My approach ,if it works leave it if it doesn`t sort it out.The question that I have is why do we have a gas shock?( my pre-loaded tension)
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  #621  
Old Thu 23 August 2012, 09:08
MariusL
Just call me: Marius #22
 
Centurion
South Africa
No Hennie not pre-loaded tension. It is to take the weight of the Z slide off the motor and to balance the holding torque between up and down. So the Z slide seem to weigh nil.

Pre-loading on the rack is required as it pulls the teeth of the pinion into the rack in order to make a positive mesh and ensure constant contact between the pinion and the rack. Secondly, as the rack does not have very good linear characteristics, it is required to make sure that contact is maintained at a constant pressure all over the area of the rack.
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  #622  
Old Thu 23 August 2012, 09:31
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
Marius the distance of rack that I use will be about 50mm when I am cutting ( 2 d cutting 95 % of the time and even 3d cutting).Even if we let it go up to the max and down to the max we only cut max 60 mm thick material.

I do see your point and I know what you mean by having constant contact with the Rack to have a perfect positive mesh.Why don`t you come to my w/shop for coffee,and see what I have done.Yes I have looked at the option of even having a spring pulling the rack against the pinion.
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  #623  
Old Thu 23 August 2012, 09:42
MariusL
Just call me: Marius #22
 
Centurion
South Africa
PM me your details and I will make a turn there.
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  #624  
Old Thu 23 August 2012, 11:58
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
I will sms it just give me a call before you come through
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  #625  
Old Fri 24 August 2012, 07:21
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
First cut with new z-slide

I am Happy with the first cuts all nice and square.
Attached Images
File Type: jpg mproject 014a.jpg (11.5 KB, 619 views)
File Type: jpg mproject 015a.jpg (13.8 KB, 616 views)
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  #626  
Old Fri 24 August 2012, 07:47
KenC
Just call me: Ken
 
Klang
Malaysia
Sure, backlash in the Z-axis doesn't make any difference in cut quality when doing 2D cutting.
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  #627  
Old Fri 24 August 2012, 16:53
danilom
Just call me: Danilo #64
 
Novi Sad
Serbia
how much backlash can it be. did anyone ever measured the rack backlash?
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  #628  
Old Fri 24 August 2012, 22:03
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
Noting that can`t be fixed with a bit of sanding.
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  #629  
Old Thu 04 October 2012, 10:12
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
I got a quote from an engineering firm that manufactures module 1 gears and what not.I didn`t know that a 30 teeth module 1 pinion gear would cost R 318.00 + 14 % vat. And a 180 teeth module 1 gear would cost R 1620 + vat.Dam the effort to go to Nusaf is now worth it .
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  #630  
Old Thu 04 October 2012, 10:19
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
Made this recently Bamboo Bar chair for my bum.
Attached Images
File Type: jpg stoel.jpg (14.4 KB, 464 views)
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