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Chester Champion V 16 Z axis mod

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David George 112/08/2018 20:28:34
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753 forum posts
261 photos

Just started to change the Z axis handle to 90 deg. hand wheel and to fit a ball screw and motor to top of column for power feed.

 

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David

 

Edited By David George 1 on 12/08/2018 20:29:25

David George 131/08/2018 11:03:59
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753 forum posts
261 photos

Done a bit more work on top housing for bevel gears.

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side shaft and bush to make next.

David

David George 101/09/2018 20:36:50
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753 forum posts
261 photos

Shaft and bush turned now I just need to cut keyways in gears and screw bush into place to get basic hand wheel moved.

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Need more information on a 24 volt DC motor to drive the axis. How much power would I need? would it need to be a geared motor for slow feed with enough power to drive axis fast traverse.

David

Ian Parkin01/09/2018 21:34:44
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606 forum posts
166 photos

dsc00854 (large).jpgOn my mill and a few other machines I,ve used parvelux motors from a seller on eBay

These are 24 v and draw about 2 amps and run about 40 rpm

He sells these motors new and unused for about £25

Edited By Ian Parkin on 01/09/2018 21:35:10

David George 104/09/2018 16:11:58
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753 forum posts
261 photos

Done the side drive shaft and phos. bronze bush but ordered the wrong keyway broach from Arc so I will have to wait for new delivery. Made the keys and fitted them to shaft ready for when the broach arrives.

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David

David George 118/09/2018 11:32:06
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753 forum posts
261 photos

Just had a few days on holiday nr Bristol so only just got back to workshop this week. Broached the bevel gears and fitted to shafts ok finished milling the main block so assemble and try in machine! Found that I had cut two of the cap screw holes out of position slightly so have to dissemble and slot holes to suit wrong dimension on drawing must have had a brain storm.

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David

geoff walker 118/09/2018 17:31:52
281 forum posts
120 photos

Nice work David, is it your own design?

Looking forward to seeing it completed.

A you tube video of it in use would be a good idea.

Geoff

David George 122/09/2018 16:58:51
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753 forum posts
261 photos

The handwheel stage is complete and working. It is so much better to use I can look at the cutter and wind the handwheel without standing on small stool. Next to fit the motor for powered drive as well.

Ian thanks for the information on the motor perfect for the job just needs a bit of thought so I can disconnect motor drive to use handwheel.

Geoff yes its all my own work but it is the sort of thing I would have to do occasionally before I retired.

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David

Neil Wyatt22/09/2018 18:19:42
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15823 forum posts
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73 articles

You should be writing that up David!

Neil

David George 104/10/2018 13:54:29
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753 forum posts
261 photos

Just been making the coupling for the motor and trying to decide how to disconnect it. I have bought some springs to support the motor and help disconnect the coupling I have made.

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Next to get the motor mounted on top plate and spring load the plates on top.

David

geoff walker 105/10/2018 07:46:00
281 forum posts
120 photos

You should be writing that up David!

Neil

Sounds good to me I'll second that.

M.E. or M.E.W., I would imagine both editors would be very interested

Geoff

David George 110/11/2018 21:06:59
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753 forum posts
261 photos

I had a break from motorising the Z axis when I found that the DC motor was to fast and no power and jumpy when slowed down. Thought about putting a toothed belt and pully on but decided to fit a stepper motor on instead. Baught a new motor and driver.

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David

Martin Connelly11/11/2018 07:20:55
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839 forum posts
93 photos

If you have problems of too little torque from the stepper for raising the head you can get axial planetary gearboxes with suitable gear ratios to slow the head movement and increase the torque. They can be added with minimal further engineering as they are made to suit standard stepper motors.

If you think about the maximum rpm you need for your leadscrew and the maximum available from a stepper motor a suitable ratio should be an easy calculation.

Martin C

David George 117/02/2019 17:12:17
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753 forum posts
261 photos

Hi had a bit of progress with the power to stepper motor look at vid on https://www.youtube.com/channel/UC40QHbhXPF7MyiUT_hacScQ

David

David George 117/02/2019 23:08:49
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753 forum posts
261 photos

A few pictures of nearly finished job.

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David

David George 117/02/2019 23:12:06
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753 forum posts
261 photos

Need to install limit switches to prevent overrun etc. The power supply is under the bench 24 volt and 5 volt signal.

David

David George 103/03/2019 09:30:54
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753 forum posts
261 photos

At last fitted the limit switch and it is finished. Satisfied with the outcome it does what I hoped for and no backlash with th ball screw.

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David

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