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  1. blfarrar

    Grit finish

    I am involved in the grinding & polishing of Hydraulically pressed concrete paver slabs (called pavings flags) here where I work in Yorkshire. The issue I am trying to solve is to establish the actual surface finish we achieve. We measure flatness of the slab (the size varies but up to 600mmm x...
  2. blfarrar

    Slide Rules. Collecting and discussing.

    Has anyone seen FEARNS rotary slide rules. I got one sone years ago that calculates the volume of cylindrical vessel with flat ends, domed ends (concave or convex ON ITS SIDE like you would have with a storage tank. You dial in the dimensions (Metric) the actual depth of liquid & it gives the...
  3. blfarrar

    Severance bonus

    If you leave your existing job -try to leave with a good relationship, most employers ring & ask for references - if you create bad feling this can follow you for a long time. Also having a good source of a reference can be the key to getting a job later on in life Bruce L Farrar. Works...
  4. blfarrar

    Is this possible ?

    I have accessed the site for the commercial water generators, fair play guys I have learnt something I wasnt aware of. Refering back to the original question this product is not quite the same in terms of recovering energy to drive the device (which simply cannot be done due to inefficiencies)...
  5. blfarrar

    Find the cfm of air compressors

    If you can get the makers data for the compressors that would be a good start. You need to access a UK government "Department of the Environment" department doucument Good Practice Guide 126 - Compressing Air Costs Contact ETSU Harwell Didcot Oxfordshire OX11 0RA tel 01235 436747 Cost was £3...
  6. blfarrar

    Friction and contact area

    The coefficiaent is independant of surface area, the actual efficiency of device is dependant on the surface area - hence bigger brakes on faster cars. Bruce L Farrar. Works Engineering Manager Marshalls Mono PLC.Brookfoot Works. Halifax W.Yorks UK
  7. blfarrar

    Is this possible ?

    Compressing air whatever the humidity means the air is heated up, cooling this in a heat exchanger presumably at the same pressure will put air through dew point & dry or de humidify the air this water can be drained off with a slight loss of pressure. The condensate will be water with all the...
  8. blfarrar

    Filter element cleaning

    If the fuel is going to be run through a diesel engine - the contamination & failure of the pumps & injectors will outway any savings made in re-using filters. If the diesel fuel isnt going into a compression injection engine then maybe rig with a filter casing with revers flow may be a method...
  9. blfarrar

    Flywheel Energy Storage devices

    Fly wheel mass (wieght) is a critical factor - lighter materials (eg alloys) store less energy than steel or cast iron. This can be calculated using the center of gravity of the cross section referenced to the distance away from axis of rotation & is proprtional to rotational speed (rev/min) &...
  10. blfarrar

    Thread Sizing

    The basic rule for length of thread engagement is at least on to one & a half time the diameter of the thread. Very critical on alloys that this is not reduced. The actual tensile strength of a fastener is well shown in most screw makers data sheets, but it must be realsied that the fastener...
  11. blfarrar

    Aluminum adhesives

    I have used CIBA Geigy Araladite on many tasks with very good results. They have both quick setting & standard (4 hours). If the joint is a safety critical joint you may want to speak to their technical people, remember adhesives such as these work on aero structures & can join differing...
  12. blfarrar

    Lockwashers - To Use or Not to Use

    If you want lock washers that do work try Schnorr Washers - these do the business & are fitted to tiens that are critical - such as parts in printing machines & aerospace where detachment of even the screw or nut into the mechanism is not an option. Search the webfor a local supplier Bruce L...
  13. blfarrar

    Venturi design using diesel flow to create a vacuum

    The question I ask is what do you want to use the vacuum for? What do you want to evacuate? as what ever you pull in will mix with the diesel & contaminate it. If you want a source of info on air operate ejectors look at the HMC Brauer site. Thier comressed air ejectors are impressive Steam...
  14. blfarrar

    Flat Fabric type air cylinders

    What I am looking for is very much like a length of "firehose" with both ends closed off with a small tume installed to allow the entry of compressed air. I have found a comany a few mile where I am based that uses these for closing doors (Rolladoor) they have given me some help - but it would...
  15. blfarrar

    Flat Fabric type air cylinders

    Thanks for the data Guys The type of flat tube cylinder I have seen & used is quitre small - say 4 0r 5 inches long & 1-1/4" wide & will inflate to a round sate if not contained in a mechanism I am looking at building these into a device to move 10mm max. The whols idea of air cylinedrs of this...
  16. blfarrar

    Torque developed with a hammer wrench

    Howdy If you think about this it isnt far away from the technology of today that use angle as the criteria rather than a torque wrench. Having had the classical education that torque wrenches were the only way to go....I found it alien to consider torque angle. But when you think about it this...
  17. blfarrar

    taut wire alignment limits

    Hi Depends really on the attitude of the wire, I worked extensively on taught wire measurements in machine tools - but we always ahed the object to be measured in sucha position that the wire was vertical - supending a weight, the weight being in a bucket of lube oil. We used a converted...
  18. blfarrar

    Flat Fabric type air cylinders

    I have got an urgent requirement to locate a source of pneumatice air cylinders of the type that resemble a piece of "firehose" that when inflated make a shape that resembles a "sausage" (the thing that goes inside a "hot dog (weiner ??)) !! I did use some some yerars ago that were made by a...
  19. blfarrar

    Taper Roller -pumpin action

    Reply to English Muffin. Answering any of the sitautions & challenges (not problems !) in this forum has to be seen in context that we (especially "I" don't know the specifics & most of the answers are generalising. To answer what you have stated depends on a few factors. My experience on...
  20. blfarrar

    Oil Coking limits

    The data I got when working as a marine engineer from the "old guys" was 120deg C - after that the oil carbonised - everthing in a marine engine with oil lube to white metal is kept below this value as the carbonisation of oil blocks oilways. As for your seals - dependant on what the...

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