Wednesday, July 25, 2012

Drill Bit Sizes Used For J-Head Nozzles

At one time, about 2 years ago, I used metric sized drill bits to drill the nozzle orifice.  It was discovered that these drill bits were drilling holes larger than the rated size.  For example, a 0.50mm drill bit would drill out a hole about 0.55mm in size.  I then made a decision to use slightly smaller drill bits in order to ensure that the orifice would be as close to the rated size as possible.  The drill bits used are as follows:



Orifice Size  SAE Drill Bit  Actual Metric Size
0.35mm   0.0135  0.343mm
0.40mm  0.0157  0.399mm
0.50mm  0.0189  0.480mm

Monday, July 23, 2012

Aluminum J-Head Mk V, 1.75mm conversion, and Mini J-Head Updates

The 13 gram aluminum J-Head Mk V has been tested and proven to work fine.  While the only advantage is it's light weight, I am planning on making it available in the near future.

Many people have asked me if and/or when I will have 1.75mm hot-ends available again.  While I was planning on producing the mini J-Heads, that was when the 3mm to 1.75mm conversions were a lot more involved than they are now.  With the Mk V design, a conversion is a lot simpler than with the Mk IV design.  As a result, I am planning on making Mk V-B 1.75mm conversions available in the very near future.