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Thread: Surface Plate Question
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19th Jul 2018, 02:44 PM #31Most Valued Member
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Well i think i may have found my plate.
I got a reply to one of the many emails i have shot off.
1000x630x150 grade 00 plate for $968 +GST. Thats ex Brisbane so i need to pay transport as well. They quoted me $77 transport for a 630 x 630 plate which is bloody good. Id imagine a 1000x630x150 couldnt be much more than twice that.
So thats a 1000x630x150 Grade 00 plate for about $1200 which i reckon is the best deal going.
They also offer a stand for it for $465 plus GST but i think i can do a good job at making my own for that price.
Can anyone di a better deal than this.
Simon
Sent from my SM-G900I using TapatalkGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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20th Jul 2018, 08:37 PM #32Most Valued Member
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Update. Delivery is $160 incl GST To Dandenong.
Its a 3 month wait as it will be in their next container shipment. Ill put a deposit on it for now.
Sent from my SM-G900I using TapatalkGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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21st Jul 2018, 11:16 AM #33Diamond Member
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I think that plate is a good Simon. The big advantage with a new plate from a reputable seller is you know it will be flat. Any 2nd hand plate is really a unknown.
This video should give you some ideas for a stand. Robin Renzetti is the gold standard for precision on youtube
https://www.youtube.com/watch?v=yPhzp-OG67s.
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21st Jul 2018, 11:27 AM #34
Hi Simon,
I have read that in order to maintain the the calibration a surface plate shold be setup with the same mounting points as were ued to calibrate it. I don't yet have a surface plate so I don't know how much changing the mounting points affects the accuracy. Might it be worthwhile chasing the importer to see where the mounting points are on their stands? Assuming here that the stands they supply use a common set of mounting points to the stands the plates are calibrated on!
Have those of you with surface plates, checked the accuracy when you installed it or have you just said good enough for the work I am doing? And how have you checked the accuracy, repeat-o-meter?
Cheers
The Beryl BlokeEquipmenter.... Projects I own
Lathes - Sherline 4410 CNC
Mills - Deckel FP2LB, Hardinge TM-UM, Sherline 2000 CNC.
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21st Jul 2018, 11:38 AM #35Most Valued Member
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Yea thanks snapa.
The stand should be straight forward. Fiddliest bit will be the feet for the plate and the legs. I assume this plate will be no different to any other and will have been calibrated whilst being supported at 3 points.
I think i will make the stand with adjustable legs and casters so that when the adjustment feet are screwed down it lifts the casters off the ground. That way if i want to move it i can just wjnd in the feet until it sits back on casters.
50x50 rhs should be sufficient.
Cheers.
Simon
Sent from my SM-G900I using TapatalkGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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21st Jul 2018, 11:57 AM #36Most Valued Member
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Hi Bery,
You posted same time as i was writing.
Yep the done thing is to ensure you support the plate in the same location as it was during calibration. Usually 3 points. My understanding is that some manufacturers mark these locations underneath, however you can determine these points mathematically.
Wrt testing, Ray (i think) aquired a laser interferometer and used it to tested one they bought in a group buy a few years ago.
A repeatometer can detect local high and low spots but cannot be used for overall flatness determination. I think most people with plates just buy the best plate they can afford/justify and just assume it is as flat as they need.
Simon
Sent from my SM-G900I using TapatalkGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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21st Jul 2018, 03:06 PM #37Member: Blue and white apron brigade
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Thanks for the vid link snapatap. Some interesting ideas there.
I have scored an small (250 x 450mm) elderly unknown CI plate courtesy of AB and when I get over this bung knee problem I hope to start on a stand for it. I have some 40x40x4mm SHS that I plan to use for the frame. There's a spot under one end of a 900 mm wide bench with a 300 mm overhang that I'm going to make the stand to suit so I can tuck it out of the way this will allow me to make the stand about 300 x 800 x 750mm tall to give it a bit more stability.
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21st Jul 2018, 03:47 PM #38.
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Bob,
There is every likelihood that that cast iron plate isn't as flat as you might want it to be. Rather than waste time making a stand how about getting hold of one of Carbatec's boy's size granite plates ? https://www.carbatec.com.au/granite-surface-plate I have one and use it for most of my set outs and for checking the flatness of smallish stuff. It is also handy being able to place the plate on a surface to be checked.
Bob.
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21st Jul 2018, 04:02 PM #39Most Valued Member
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I have one of them too. Its very handy for small work and it just lives under the bench when not in use.
Simon
Sent from my SM-G900I using TapatalkGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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21st Jul 2018, 04:06 PM #40Member: Blue and white apron brigade
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21st Jul 2018, 10:41 PM #41Most Valued Member
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That will blitz it Simon, your plate will be the same size as the one you used at my place.
I made my stand out of what l had and l only bought wheels for it, so 60 or 65mm pipe,
50 x 6 angle and 50 x 5 or 6 shs, l put adjusters in the frame with 7/8" x 20 tpi threads with
ball bearings in the ends for less friction when leveling the plate.
I like your idea of the adjustable feet and done well should make it sturdy.
Anyway here is some pics of mine for you......
cheers, shed
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21st Jul 2018, 10:48 PM #42Most Valued Member
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Thanks shed. Were the supporting points marked on your plate or did you just calculate the bessel points from scratch?
Are the ball bearings to allow swivel for the adjustment pads?
Simon
Sent from my SM-G900I using TapatalkGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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21st Jul 2018, 10:59 PM #43Most Valued Member
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21st Jul 2018, 11:03 PM #44Most Valued Member
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21st Jul 2018, 11:09 PM #45Most Valued Member
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Thanks Shed. My understanding is the plate should be supported at its bessel points not the airy points. I doubt it really matters for our use.
Airy points support a beam at such a location that the ends are parallel. However bessel points create the least amount of deflection in a beam.
Simon
Sent from my SM-G900I using TapatalkGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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