
john marcus
Supporting Member-
Content Count
652 -
Joined
-
Last visited
Community Reputation
2 NeutralAbout john marcus
- Birthday 01/01/1953
Profile Information
-
Gender
Male
-
Location
los angeles
Recent Profile Visitors
-
john marcus started following Contact wheels for the size challenged, Clark CPT portable hardness testers? and power hammer build
-
Clark CPT portable hardness testers?
john marcus replied to Adam Reggie's topic in Tools and Tool Making
https://www.ptc1.com/316 -
Anyone want to exercise their algebra muscles?
john marcus replied to billyO's topic in Tools and Tool Making
can not determine from this data. put the both in a block of metal ( drilled hole) then read read them. the difference should be the correction :). -
Do rolling mills use only people squeezing power?
john marcus replied to Mike Jesensky's topic in Tools and Tool Making
Yes.there is a compound foot pedal. Plenty strong. -
Belt sander modification questions
john marcus replied to Conner Michaux's topic in Tools and Tool Making
i dont believe you can have to much hp ( may cost a few cents electrically) rpm is different than hp........may or may not need to increase or decrease the speed of the belt to keep it usable and safe. -
Ames AT-2200 Rockwell hardness tester
john marcus replied to JenniferP's topic in Tools and Tool Making
i have an old one you can have -
see https://www.ptc1.com/316
-
https://www.markingmethods.com/store/pc/viewCategories.asp?idCategory=11 they make nice electro chemical etching stencils yes you can mark finished knives with their set up.
-
My company makes these. Many knife makers use them. Please call you have any questions. Ptc1.com. john
-
KMG Motor Bogging Down: Any thoughts?
john marcus replied to Dave Stephens's topic in Tools and Tool Making
-
KMG Motor Bogging Down: Any thoughts?
john marcus replied to Dave Stephens's topic in Tools and Tool Making
if it is an ac vfd i would suspect the vfd as being set up incorrectly.... eg max current or torque is set to low check owner manual for set up parameters -
KMG Motor Bogging Down: Any thoughts?
john marcus replied to Dave Stephens's topic in Tools and Tool Making
it looks like a DC motor controller from the picture........which i suspect is behaving badly. you can open it up and look for loose wires or a burnt out component. after that you will need to contact the folks who made the control and see what they think. ps where did you move to ?? -
more is better...... if you use a variable speed drive i would like 2 to 3 hp at low speeds. i would recommend the deluxe setup as a 3 phase motor with a variable frequency speed drive that has single phase input ( unless you have three phase) and 3 phase output. The voltage on both ends would be 220. I dont know much about single phase motors and their speed controls.
-
Contact wheels for the size challenged
john marcus replied to Doug Ward's topic in Tools and Tool Making
the aluminum side plates were cut by waterjet. I rolled the rim from 1/2x4 inch aluminum on a three ring roller. then welded the whole thing up. I mounted the aluminum wheel on its drive shaft and under power i used a angle grinder mounted on a slide to sand it until it was true. i then removed it and layed it on its side. i made a outer ring from sheet metal about 1.25 inch larger in diameter than the aluminum wheel (coated with mold release). every thing was put in place and sealed with wax. two part urethane was mixed and poured into the gap between the ring and the aluminum wheel. -
burr king makes a wet 4x60 i have built a very large wet belt grinder with a 36 inch diameter contact wheel ( urethane lined)