1 Topic by Staffordknot

  • Staffordknot
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Topic: Thread and bolt sizes used on sd3

Hi i want to buy some replacement machine screws / bolts for assembling a new extruder... I don't want to take the old one apart as its clearly broken inside and will know doubt fall apart as soon as i remove screws.

Also the z screw what size is this? Can anyone tell me how much one revolution will raise the bed?

2 Reply by adrian

  • adrian
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Re: Thread and bolt sizes used on sd3

Staffordknot wrote:

Hi i want to buy some replacement machine screws / bolts for assembling a new extruder... I don't want to take the old one apart as its clearly broken inside and will know doubt fall apart as soon as i remove screws.

They are a mix of M3 and M5. No ones bothered particularly logging whats there because about 40% of it relates to the jigsaw specifically and is unneeded when using any sane extruder assembly.

Do you really see yourself building another jigsaw ? or something else.. because the something elses usually come with their own BoM's...

Staffordknot wrote:

Also the z screw what size is this? Can anyone tell me how much one revolution will raise the bed?

This ones been done to death already. Most recently in the 5mm fitment thread. 5/16" or 0.3125 is the size designation. 
One revoloution is 1.411mm's on an accurately cut rod. An individual rod may differ.

3 Reply by Staffordknot

  • Staffordknot
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Re: Thread and bolt sizes used on sd3

Sorry i meant the z adjustment screw.

I'm going to use the mk 4, but i don't want to disassemble my current one, i was going to buy a new extruder stepper

4 Reply by adrian (edited by adrian 2013-06-04 10:01:55)

  • adrian
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Re: Thread and bolt sizes used on sd3

adjustment screw is 20mm M3. On a standard pitch bolt its 0.5mm's per revolution.

If you want to build a Mk4, the BoM is very simple. 4 x M3's of 40mm's for the motor mounts, 1 x M5 for the bearing, and 2 x m3 screw or bolt of 10-15mm's for the clip-mount.

5 Reply by Staffordknot

  • Staffordknot
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Re: Thread and bolt sizes used on sd3

Thanks adrian!