Show all posts by user
General discussions. For specific printers / electronics / fabrication methods / softwares, please see other sections.
Re: modify ramps 1.4 to make it more reliable ? - 9 years ago
I had a friend order a RAMPS 1.4 from Geeetech. Instead of a 1K ohm resistor for the X-axis, it had a 100 ohm resistor. And T1 had a 100Kohm resistor, instead of 4.7K ohm resistor. The other resistors had terrible tolerances. I buy all of my RAMPS from K Bell on eBay Always high quality, zero problems. They are in St Louis....I am in Arkansas, which the short distance also makes them more apby nitewing76 - RAMPS Electronics
Re: Bed Auto Leveling.. check this out - 10 years ago
Quoteintosite What value disc capacitor should i try? When using a LM78XX (LM7805, LM7812, etc), the minimum circuit is given in Figure 8 of the datasheet. Which says to use a 0.33 μF or larger tantalum, mylar or other capacitor having low internal impedance" (pg 25) between pins 1-2 and a 0.1uF between points 2-3. The datasheet did not specify what type of capcitor to use for the 0.1uF. But,by nitewing76 - General Mendel Topics
Re: extruder not working on sprinter/pronterface or repetier with ramps 1.4 - 10 years ago
Quotearvelarve ...I have not checked the software for what the magic temperature is, but heating up the extruder head to 70-80ish degrees things came alive In Marlin, the default setting is on line 251 of the configuration.h file: #define EXTRUDE_MINTEMP 170by nitewing76 - RAMPS Electronics
Re: Servo Motor Help - 10 years ago
M-Codes and G-Codes are nice for temporary...on-the-spot adjstments. You should always mimic these changes in the configuration.h through WinMerge or Notepad++. Othersiwse, you could lose all calibration data (e.g. auto-bed level, DEFAULT_AXIS_STEPS_PER_UNIT, etc). Not really sure why Smartrap says to put the servo on the I2C bus, when, as RegPye pointed out, the board already has places for theby nitewing76 - Smart_Rap
Re: Auto Bed Leveling Servo not responding (M280 P0 S80) - 10 years ago
Twist the wires of each stepper motor into pairs (e.g. red/blue and green/black). Then place those into expandable braided metal sleeving (McMaster-Carr. If you're not in the USA I'm sure you can find a comparable product in your country. Then crimp a wire to earth ground. Also, ensure the wires of any fans are twisted. An electric drill comes in handy for making twisted pairs...but ensure you pby nitewing76 - Reprappers
Re: Lead Screws and Smooth Rods- best bang for buck? - 10 years ago
Quotekonwiddak ...I stuck them both in a drill, spun them round and polished them to a shiny finish with some brasso... Brasso is likely to be incompatible with linear bearings, such as LM8UUs and is definetely incompatible with non-petrolem based lubricants. Brasso is petrolem-based and over time will degrade the bearing's polymer inner sleeve into mush. Same is true for petroleum based lubricaby nitewing76 - General
Re: Scaling up Kossel Mini - 11 years ago
@ hercek Quotehercek QuoteA2 I found no contradictions in the Gates chart. Post the units, and show your work to avoid confusion. Claim 1 of the document: The last column of the table specifies unit as lb/in² for 1" wide belt. Claim 2 of the document: Note 7 specifies the formula for the belt elongation computation as BeltElongation = (BeltLength * TensileLoad) / TensileModulus. Lets specify whby nitewing76 - Delta Machines
Re: Scaling up Kossel Mini - 11 years ago
QuoteA2 @ A2 1 inch² = 0.00064516 meter² 1 pound-force = 4.4482 newton Tensile Modulus = 18000 pound-force/inch² 18000 pound-force = 80068 newton Tensile Modulus = 80068 newton/0.00064516 meter² ] Granted the author should have used (lbf-in2)/in or lbf-in2 per 1" of belt....but we can't spilt up the 18,000 since this is a value of Stress (numerator) vs. Strain (denominator) of the materials usby nitewing76 - Delta Machines
Re: Scaling up Kossel Mini - 11 years ago
Quotehercek TheTechnicalNoob: thanks for the link. Hell, that documents must be writen by heretics of physics. Not only the authors use "hogshead" units, but they cannot even get it right, even with them. Ok, so they define modulus as lb/in² but (based on the formula (in note 7) for ussage of their modulus values) the unit is actually only lb. Or at least I hope this is what they intended (one cby nitewing76 - Delta Machines
Re: Repstrap Universal CNC - 11 years ago
Quwat, I'm just a former U.S. Marine and 35yr old mechanical engineering student, but it seems you're getting some good advice. A2 was on point about spreading the X axis farther apart and beefing up the rod diameters. You can compare it to standing with your feet together vs. shoulder width apart...or standing on something like a soda can vs. a cinder block. When I designed my CNC, I went loby nitewing76 - Reprappers
Re: Introductions - 11 years ago
I'm from Russellville...by way of White Hall, Watson Chapel, Van Buren, Fayetteville, and Little Rock (not in that order). All of those moves, except one, were related to full-time job changes in the Arkansas Army National Guard. Now, I'm a full-time Mechanical Engineering student at Arkansas Tech. As an MCEG student, I'm a freshman/sophomore. But, I've accrued enough credits to be considered a Jby nitewing76 - RepRap User Group - Arkansas