Assembly step 8

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Revision as of 05:40, 12 May 2013 by Willadams (Talk | contribs) (Full Gantry Assembly: add Dealing w/ a boken tap)

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(click the picture to download the PDF file)

NB: The above image does not show the 2 Belt Anchors, 2 M5 washers, or 2 insertion nuts.

Note: if you did not buy a kit w/ pre-tapped MakerSlide, and have not yet tapped your Makerslide, read the section below. Otherwise, skip to the Full Gantry Assembly section below.

Tapping the Makerslide extrusion

The Inventables kits comes with the Makerslide untapped. The premium and full kits include an M5 tap and appropriate t-handle. If you purchased the mechanical only kit, you will have to buy an M5x0.8 tap and #0-1/4" t-handle to complete this operation.

Tapping means to cut threads on the inside of a hole. There is an entire industry based around this process, and some people take it very seriously. If you look around the internet you can find 1,000s of site with "drill and tap" charts. These charts tell a person how big of a hole is required to be tapped to a certain thread size. There is a great write-up over at Wikipedia describing Tap and Die.

For instance, if you want to have a finished, threaded hole that will accept a standard M5 bolt (.8 pitch), you'll actually need to start with a hole that is only 4mm. This is because as you're cutting the threads into the hole, you'll obviously need material to remove. Always try to start as straight as you can in respect to the hole, or part, respectively.

Some people use a t-handle (which is my preference) something like this from amazon works well. You would also need a tap like this. Other people just put the tap into a hand drill and set the torque to a low setting (something like 10 on a scale 1-21, where 21 is "drill"). Because Makerslide is made from aluminium, which is a "soft" metal, it's fairly easy to tap. But, you'll need a cutting fluid to make it easier - any kind of lubricant, e.g. WD-40, should work well. And others just grab onto the end of the tap with a pair of vise grips or other pliers. This is obviously not the recommended way, but can get you by in a pinch.

When tapping, it's important to not just torque down and twist as hard as you can. Remember, as you're cutting the threads into the hole, the tap is removing material. That material has to go someplace. Ideally, the tap will be trying push the material out of the way either by bringing it back up the hole, or pushing it out the bottom. (If you're doing a through hole you can watch the material start coming out the back of the hole.) But if you encounter resistance, it's probably due to chip buildup along the tap. Slowly reverse the tap until it's out of the hole, clear the chips from the tap, and start again. Depending on how deep the hole is you're tapping, it may take several times of cutting/removing to accomplish your depth.

Rule of thumb:

  • The deeper the flutes in the tap, the more material it will be able to hold before clogging.
  • Cutting fluid (or lubricant) enables debris material to flow more easily up the length of the flutes.
  • If there is enough lubricant, it may be enough to back a turn or two to get the chips flowing through the flutes, without the need to remove the tap all the way.

Dealing w/ a boken tap

A broken tap is unlikely if one is:

  • careful
  • patient
  • uses lubricant

and above all, doesn't force things.

However, since the tap is ferrous, and MakerSlide aluminum, one can do this w/ kitchen chemistry. If doing so, use caution: dissolve a tap broken in makerslide

Full Gantry Assembly

  • Clean ends of extrusion of any debris.
  • Snug bolts on Gantry - Y Idle Mount Plate.
  • PRO TIP! - Set eccentric wheels on SM-XZA1 to their widest position before attempting to slide onto makerslide.
  • Slide X/Z Assembly onto Makerslide Extrusion
  • Snug Bolts on Gantry - Y Motor Mount Plate
  • Work your way from each side in a X pattern.
  • Align top of extrusion with top of plate.
  • Keep square

Bill of Material

Sortable table
Item Qty. Part Num. Title
8 6 SM-H03 M5 Flat Washer
19 6 SM-H07 M5 x 10mm SHCS
20 1 MSK01-02 Makerslide Extrusion - 375mm
21 2 SM-H11 Insertion Nuts
22 2 SM-M05 Belt Anchors
Assembly 4 1 From Assembly step 4
Assembly 5 1 From Assembly step 5
Assembly 7 1 From Assembly step 7

User Submitted Notes

(This is the section to add your own notes pertaining to this sub-assembly) If you run into a problem or find yourself asking a question, please post the solution here to help the next person who has the same problem/question)

This image here is missing the belt anchors.

The hole diameter for an M5 0.8 tap is 0.166". If your tap doesn't easily start you may want to drill the holes up to 0.166" (at least for the first 2-3mm of the hole).

The holes only need to be tapped 10-12mm deep for the M5x10mm screws, but tapping more deeply does no harm, and allows one to use longer bolts, which is useful when adding washers or belt anchors.

Recently shipped kits may have the belting already cut into 2 pieces.

Next: Assembly step 9