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Thread: G540 & CNC Build
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7th September 2010, 07:49 PM #106SENIOR MEMBER
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7th September 2010, 09:42 PM #107
yep a good bearing grease will do.
I like to move it move it, I like to move it.
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8th September 2010, 08:50 PM #108
Thanks Gents. I added some grease and altered the motor speeds. Stalled it a few times in the process but have it sitting on a velocity of 2800mm/min with acceleration at 120mm/min. I dont think I'd need to run it any faster.
Here's a better video. Seems my camera has a higher resolution setting .
Brad.
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10th September 2010, 06:45 PM #109
Before I start the Y - axis Im looking for a little input about the width the bearings should ideally be spaced. The X-axis are 250mm as Greg has suggested. My rails on the Y - axis are 1 metre long.
Brad.
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10th September 2010, 07:11 PM #110SENIOR MEMBER
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Personally i think size of rails etc is important but normally i recommend about 120 to 160mm outer. Its also dependent on the width of your z axis.
Daniel
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10th September 2010, 07:19 PM #111GOLD MEMBER
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Typically I work with 120 outside to outside of bearing. The Y axis only carries the Z axis and your bearing rails are a lot closer together so less racking therefore there is not the need have wider spacing. I'll go with Daniel on 120 to 160.
Cheers,
Rod
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12th September 2010, 11:45 AM #112
OK.. I'll draw it up with a 120mm width between the outside of the bearings. And see how it all fits
Brad.
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15th September 2010, 09:26 PM #113
I purchased 40 t-nuts and some more aluminium. Mounted the top rail to the gantry with a 6mm plate spacer/base. One lot of bolts holds the rail through the 6mm plate into the t-nuts. The other side of the rail is bolted to the plate and the plate is bolted to the t-nuts. Worked great. So now there's no need to put any holes in the gantry.
Brad.
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15th September 2010, 11:33 PM #114GOLD MEMBER
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Hi Brad,
great minds think alike
I am doing the same with my gantry beam at the moment but I am making my T nuts. Boring drilling and tapping task but it saves a buck or two.Cheers,
Rod
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16th September 2010, 12:30 AM #115
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16th September 2010, 01:41 AM #116GOLD MEMBER
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You must have a mate in the business. Last time I got Item T nuts they were about $4.00 each - that pans out to $200 for my setup. They are a 4mm screw for the rails I have.
Are yours the flat rounded plate type as that would explain the difference in price.Cheers,
Rod
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16th September 2010, 01:50 AM #117
Maybe she messed up the price when I ordered them. They have a flat top with a round underside and a single ball bearing in them. I bought both 5mm and 6mm T- nuts, but she said they also had 4mm.
Brad.
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16th September 2010, 02:11 AM #118GOLD MEMBER
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They are the ones. Either freight to Perth is really expensive or you got a bargain.
I wrote to them last time complaing about the price as it jumped by 100% in two months but even if they did take any notice, which I doubt they did, you still got them at the right price.Cheers,
Rod
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16th September 2010, 05:12 AM #119SENIOR MEMBER
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Bargain price, I paid $1.30 for mine for Profile 6 T-Nuts.
Good thing is they can be inserted along the rail without having to undo everything, 8020 has even cheaper nuts at ~ 50c each but its basic steel bar with a tapped hole zinc plated.
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16th September 2010, 06:30 PM #120
Yeah.. I found that very handy. I disconnected one end of the gantry before realising I could just push them in through the front.
Brad.
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