{"id":370,"date":"2013-06-07T20:39:22","date_gmt":"2013-06-08T00:39:22","guid":{"rendered":"http:\/\/templesystems.com\/?page_id=370"},"modified":"2014-03-23T08:13:36","modified_gmt":"2014-03-23T12:13:36","slug":"z-axis","status":"publish","type":"page","link":"https:\/\/templesystems.com\/?page_id=370","title":{"rendered":"Z Axis"},"content":{"rendered":"

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6\/28\/2013 – We are thinking about using the larger motor, and direct coupling it to the screw. \u00a0The motor is 4 n*m, or about 35 in-lb continuous. \u00a0The output shaft is 22mm, which is slightly larger than the screw. \u00a0The end of the screw is 15mm, with a 1\/8″ key. \u00a0Strange, but true. \u00a0We can get a coupling and make a standoff to mount the motor.<\/p>\n

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The Z axis is driven by a 3\/4 diameter 0.2″ pitch ballscrew. \u00a0The nut is run in an oilbath, and the screw is protected by a very sturdy telescoping cover.<\/p>\n

\"\"<\/a>At a glance, the Z axis looks good. \u00a0The way wipers will have to be replaced, because they have completely rotted to a point of uselessness. \u00a0The basic mechanics looks good.<\/p>\n

The screw appears to be driven through a gear pass, but I don’t have the cover off yet.<\/p>\n

The feedback system consists of a resolver and tachometer driven off the screw. \u00a0It is interesting that they chose to get the velocity feedback directly off the screw, instead of the motor. \u00a0At any rate, all of this stuff will go. \u00a0We will do a belt pass from the motor to the screw, and use the motor resolver for all of our feedback requirements.<\/p>\n

I don’t know yet what the thrust bearing arrangement is. \u00a0Hopefully it is not an oil bath, because that might make it difficult to do a simple belt pass. \u00a0We may need to design in a seal for the oil bath if that is what is there. \u00a0It very likely will be.<\/p>\n

Well, as it turns out, there was already a 4:1 belt pass (48t on the screw, \u00a0to 12t on the motor), and no exposed oil bath. \u00a0If there is an oil bath on the screw thrust bearings, it is not exposed. \u00a0We will probably be able to use the existing pulley arrangement. \u00a0We may have to get a new pulley for the motor. \u00a0We may want to upgrade the whole arrangement by getting a more modern belt tooth form.<\/p>\n

By turning the screw pulley by hand, it is clear that the slide construction has more friction than roller way systems. \u00a0The slide is a ground steel dovetail. \u00a0It is not possible to tell right off what the liner material is. \u00a0I would guess that there is some kind of teflon based liner material, but it may be iron on steel. \u00a0We could possibly pull a gib and see what we can see. \u00a0If we pull off the way wipers it might become clear too. \u00a0This type of construction will provide great finishes on the cuts, probably, but maybe a little trouble around corners and direction reversals.<\/p>\n

A picture of a GE Hi-Ak drive simiar to the drives in this machine:<\/p>\n

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This is the business end of the Z axis with the new motor mounted. \u00a0The belt is not yet in place, because we want to get the motor running prior to having the belt connected, in case we have any trouble getting control of it.<\/p>\n

The pulleys were both replaced. \u00a0The motor shaft is too large to take the original pulley, and we wanted to move up to a more modern tooth form.<\/p>\n

2014-03-21<\/p>\n

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  6\/28\/2013 – We are thinking about using the larger motor, and direct coupling it to the screw. \u00a0The motor is 4 n*m, or about 35 in-lb continuous. \u00a0The output shaft is 22mm, which is slightly larger than the screw. … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":366,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-370","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/templesystems.com\/index.php?rest_route=\/wp\/v2\/pages\/370","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/templesystems.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/templesystems.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/templesystems.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/templesystems.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=370"}],"version-history":[{"count":8,"href":"https:\/\/templesystems.com\/index.php?rest_route=\/wp\/v2\/pages\/370\/revisions"}],"predecessor-version":[{"id":372,"href":"https:\/\/templesystems.com\/index.php?rest_route=\/wp\/v2\/pages\/370\/revisions\/372"}],"up":[{"embeddable":true,"href":"https:\/\/templesystems.com\/index.php?rest_route=\/wp\/v2\/pages\/366"}],"wp:attachment":[{"href":"https:\/\/templesystems.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=370"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}